CI/CD Workflow Specification

General rules for clean, secure, reproducible CI/CD workflows. The supported first-class adapters are GitHub Actions YAML and GitLab CI YAML; their syntax, file paths, and keywords implement this policy but do not replace it. For policy that spans tools, defer to the sibling standards rather than restating it here: General rules for clean, secure, reproducible CI/CD workflows. GitHub Actions is the current implementation context, so its file paths and syntax appear in examples; treat them as adapters, not as the policy itself. Keep the rules, but rename every example workflow, script, job, and role for the target repository. For policy that spans tools, defer to the sibling standards rather than restating it here:

Read AI Workspace Infra Repository Map first. Apply the target repository's current workflow conventions; do not copy a legacy workflow's inline scripts, secrets, or broad trigger scope into a new delivery path.

• Environment routing (SIT/UAT/Prod) & Vault OIDC role names → multi-environment-delivery-and-release
• No-inline-scripts / code purity for HCL & playbooks → infrastructure-as-code-spec, config-as-code-spec
• Branching, PR targets, and committed-secret response → project-development-standard
• Cross-repository execution-script ownership and safe removal → execution-ownership-migration

1. Supported pipeline adapters

Use GitHub Actions or GitLab CI for new primary pipelines. Both are YAML-based, work with hosted or self-managed/open-source-compatible installations, and can share portable scripts, OCI artifacts, Terraform plans, CMDB files, and Vault OIDC contracts.

• Keep provider-neutral deployment logic in repository-controlled scripts; YAML selects stages, dependencies, permissions, inputs, and artifacts. Do not make the pipeline portable by copying two divergent implementations of the same deployment logic.
• GitHub Actions must pin third-party actions to the repository-approved version or immutable SHA. GitLab CI must pin external includes, components, container images, and templates to an immutable version, SHA, or image digest. Never consume a mutable remote pipeline definition on a deployment path.
• In GitLab, use rules for event routing, needs for explicit dependency and artifact flow, protected environments/refs for CD, and id_tokens rather than deprecated job JWT variables for OIDC. In GitHub, use explicit event filters, needs, environments, permissions, and concurrency with the same intent.
• GitLab secrets:vault writes fetched secrets to a temporary file by default. That default conflicts with a zero-secret-to-disk policy: use OIDC to obtain only the short-lived value needed by the job, and use a reviewed non-file delivery mode only when the process can avoid logging or persisting it.
• Deployment pipelines MUST NOT depend on volatile or unverified daily-build release assets from external repositories during automated execution. Release artifacts consumed during deployment MUST be immutable, verified in preflight, or hosted in internal artifact repositories.
• Edge node and client provisioning scripts consuming daily builds MUST implement dynamic asset resolution (with SHA-specific bundle matching) and graceful two-tier fallback to individual standalone binaries; see multi-environment-delivery-and-release §1.1.1.
• Release promotion from non-production (UAT) to production (PROD) MUST require explicit, verified immutable snapshot source refs and enforce backend-first deployment gates before publishing frontend assets; see multi-environment-delivery-and-release §1.5.1.

1.1 Jenkins migration policy

Jenkinsfile is a legacy compatibility route, not a recommended primary platform for new CI/CD work. Do not add a new Jenkinsfile or expand an existing one unless it is a time-bounded migration prerequisite.

Migrate Jenkins pipelines incrementally:

1. Inventory triggers, branch rules, credentials, agents, shared libraries, artifacts, environment mutations, approvals, and rollback behavior.
2. Extract business logic from Groovy and inline shell into versioned, provider-neutral scripts with explicit inputs, exit codes, and tests.
3. Recreate CI first in GitHub Actions or GitLab CI: validation, scan, build, and immutable artifact publication. Recreate CD separately with OIDC → Vault, protected environment controls, concurrency/resource locking, and health checks.
4. Run a non-production parity period. Compare artifact digest, target set, rendered configuration, and health result; never let both systems apply to the same mutable environment concurrently.
5. Cut over one protected environment at a time, retain a documented rollback window, then disable Jenkins deployment triggers and revoke its long-lived credentials, agent permissions, and unused shared-library access.

Do not translate Jenkins Groovy line-for-line into YAML. The target design must separate CI from CD, use immutable artifacts, and remove Jenkins-only credential or controller assumptions.

2. No inline scripts

Keep every provider command stanza to a single call. Put non-trivial shell/Python in an executable, repository-controlled script and validate it with bash -n. GitHub Actions uses .github/scripts/; GitLab CI uses ci/scripts/ or the repository's established equivalent.

GitHub Actions adapter:

- name: Install dependencies
  run: ${{ github.workspace }}/.github/scripts/<workflow>_<step>_install-deps.sh

GitLab CI adapter:

validate:
  stage: validate
  script:
    - ./ci/scripts/validate.sh

Pass Vault secrets and other values into scripts as job environment variables, never inline in the command.

3. Pin external dependencies

Reuse the target repository's already-approved dependency version unless the task is an explicit upgrade. Verify the exact tag, SHA, or digest against its publisher; never invent a version. New security-sensitive workflows should prefer immutable full-SHA or digest pins where that repository already uses them.

3. Shared scripts

Reuse cross-workflow logic via common_*.sh scripts under .github/scripts/ (e.g. common_terraform_init_backend.sh, common_run_ansible_playbook.sh, common_configure_ssh_key.sh). Step scripts delegate rather than copy:

#!/usr/bin/env bash
set -e
DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
exec "${DIR}/common_terraform_init_backend.sh"

4. Shared scripts

Reuse cross-workflow logic via common_*.sh scripts under the provider adapter directory (.github/scripts/ for GitHub Actions; ci/scripts/ or equivalent for GitLab CI), for example common_terraform_init_backend.sh, common_run_ansible_playbook.sh, and common_configure_ssh_key.sh. Step scripts delegate rather than copy:

4.1 Generalize by shape, not by step

One script per workflow step is the default drift, and it scales badly: a directory named <workflow>_<job>_<step>.sh reads as organised while being N copies of the same three commands. Group by invocation shape instead, and let the caller supply what differs.

Most CI scripts collapse into a handful of shapes — an ansible-playbook run, a terraform subcommand, an ssh action against a host resolved from the CMDB, a render/validate step. Audit by shape before adding another file:

for f in .github/scripts/*.sh; do
  grep -q 'ansible-playbook' "$f" && echo "playbook  $f" && continue
  grep -q 'terraform '       "$f" && echo "terraform $f" && continue
  grep -q 'ssh_opts='        "$f" && echo "ssh       $f"
done | sort | uniq -c

If a shape has more than two or three members, it wants one parameterised entry point. A set of playbook wrappers usually differs only in the playbook filename, how the target host is passed, and an optional extra-vars file — everything else, including the inventory path, is identical and should live in one place.

The cost of not doing this is measured in repeated fixes. When the same defect has to be patched in three sibling scripts, and a wrong inventory path in four, the duplication is not stylistic — each copy is a place the next guard will be forgotten. A shared entry point means the reachability assert (§9) and the required-variable check are written once and inherited by every caller.

Standardise how the target is selected. Passing the host as -e "<role>_hosts=${HOST}" and passing it as --limit "${HOST}" are not interchangeable: they fail differently when the value is empty. An empty -e var against a playbook whose hosts: reads from it aborts with "Keyword 'hosts' cannot have empty values", while an empty --limit against a playbook with a static hosts: line does not narrow anything. Pick one mechanism per repository so the empty case has one known behaviour, and assert the variable regardless (§9).

4.2 No hardcoded values in scripts

Anything that varies by environment, target, or release is a parameter. Domains, hostnames, IPs, zone names, registry namespaces and image tags belong in the caller's env: block or a single named constant — never inline in a script, and never as a per-file fallback.

• A default that differs between files is worse than no default. Divergent fallbacks produce output that is valid, plausible, and wrong in some files only, which is far harder to spot than a uniform failure. If several files each carry their own X or 'some-domain', they will drift, and at least one will end up pointing at production.
• Reject the "sensible default" for anything that selects a target. A default target is a silent choice made on the operator's behalf at the exact moment they forgot to make one. Require it and fail (§9).
• A literal that appears once is still a parameter if it varies by environment. Judge by whether the value could differ per environment, not by how many times it currently appears.
• Values that genuinely never vary — a fixed image tag the pipeline itself builds, a path the pipeline itself creates — are implementation detail and may stay inline. Parameterising them adds indirection for no reuse.

5. Concurrency & matrix safety

• Scope concurrency by workflow + environment so environments never block each other:

  concurrency:
    group: <workflow-name>-${{ github.event.inputs.vault_env_path || 'uat' }}
    cancel-in-progress: false

• GitLab CD jobs use an equivalent resource_group keyed by the mutable environment/resource and must not be interruptible while a stateful migration or Terraform operation is active.
• Default matrix outputs to [] / 0 when their source file is missing or during destroy:

  if [ -f cmdb.json ]; then
    hosts="$(jq -c 'keys' cmdb.json)"; count="$(jq 'length' cmdb.json)"
  else
    hosts="[]"; count="0"
  fi

• Guard matrix jobs on non-empty and non-zero counts:

  if: ${{ needs.provision.outputs.count != '' && needs.provision.outputs.count != '0' && github.event.inputs.terraform_action == 'apply' }}

• Set fail-fast: false on deployment matrices so one bad host doesn't cancel the rest.

6. Permissions & log hygiene

• Declare least-privilege permissions at the top level:

  permissions:
    contents: read
    id-token: write   # OIDC → Vault

• Never set -x around secrets. Mask any secret parsed by hand: echo "::add-mask::$SECRET".
• In GitLab, protect deployment refs/environments and use job id_tokens for OIDC. Do not grant deploy authority through broadly available project variables or retired CI_JOB_JWT variables.

7. Non-interactive tooling

CI steps must never block on a prompt:

• Terraform: terraform init -input=false, terraform apply -auto-approve -input=false
• Ansible: ANSIBLE_HOST_KEY_CHECKING=False, -o IdentityFile=~/.ssh/id_deploy -o StrictHostKeyChecking=no

Upload cmdb.json and inventory.ini as auditable artifacts. In GitHub Actions, use the repository-approved artifact action; in GitLab, declare artifacts and an explicit needs:artifacts relationship for the consuming job.

8. Workflow roles

8.0 Cross-repository snapshot orchestration

When one release spans multiple repositories, treat the snapshot as a first-class coordination artifact rather than as a collection of unrelated successful jobs:

• Resolve the source ref to an expected commit SHA per repository before tag creation.
• Create one immutable snapshot tag per repository using the same daily series (uat-daily-build-YYYY.MM.DD-r1 … -rN) across the matrix. Allocate r1 for the first UTC-date snapshot and the next available suffix for every same-date retry or later snapshot. Never move, delete, or force-update an existing tag.
• Keep the tag fan-out matrix separate from the required artifact-build matrix. A tag existing in a repository does not prove that its image, package, chart, or release manifest was built.
• Match build runs by repository, snapshot tag, expected SHA, intended event or workflow, and successful conclusion. Matching only a branch/tag name can reuse an old retry run.
• Aggregate an auditable per-repository result with distinct states such as tag_ready, unchanged, build_succeeded, build_failed, manifest_missing, build_timeout, and build_lookup_failed. Pending or unknown states are not successful.
• Resolve and reserve the suffix once before matrix fan-out. Independent jobs must not calculate different retry tags; if any participating repository already has the candidate tag, abort allocation and advance the whole cross-repository series together.

The workflow summary should include the snapshot tag, source ref, expected SHA, resolved SHA, build URL, artifact/manifest result, and retry reason where applicable. A snapshot is deployable only when every required repository passes all checks; a successful tag job alone is not sufficient.

8.0.1 Tagging and release preflight contract

Stable and daily builds may call the same tagging helper, but the helper MUST validate an explicit tag kind and reject an environment/tag mismatch before creating or updating any ref. Production entry points MUST accept only refs/tags/v* or refs/heads/release/v*; they MUST reject main, pull-request refs, arbitrary dispatch refs, and daily-build-* / uat-daily-build-* tags.

The stable path and daily path differ by tag semantics, not by a second mutable tagging implementation:

The release preflight MUST check, as one consistent matrix, the triggering event and ref, resolved source SHA, artifact build/digest/provenance, required test conclusions, GitOps desired tag, environment route, Vault role/KV path, and rollback evidence. The same computed environment must feed routing, credentials, and test selection; if one resolver says UAT while another says production, fail before credentials or mutation. A tag-exists or workflow-dispatch success is not an artifact, test, or deployment success.

A multi-cloud IaC repo typically splits responsibilities across these five patterns. The file names are examples — rename to match your repo:

8.1 Dual-plane telemetry and billing delivery

When a release carries usage accounting and operational observability together, model them as two consumers of the same exporter output. The billing plane and the real-time monitoring plane MUST be independently observable and MUST NOT make each other a runtime prerequisite:

Xray -> exporter -> Vector -> authenticated Billing ingest -> shared PostgreSQL
                                      -> Accounts API -> Portal
                         +--> Prometheus remote_write / observability -> Grafana

• The exporter MUST emit a canonical snapshot identity containing the account key (email and/or UUID), source/node identity, collection time, and byte counters. When one account appears on multiple nodes or inbounds, normalize and aggregate by the canonical UUID; do not create a separate billable account for each inbound tag.
• Vector SHOULD be the fan-out boundary. Billing consumes an authenticated push/ingest endpoint by default; Billing MUST NOT directly pull the exporter as the normal path. A direct-pull mode, if retained, is an explicitly named rollback/compatibility mode and MUST be disabled by default.
• The Vector-to-Billing sink MUST use an environment-scoped service credential, bounded retry, a durable buffer where supported, and a payload format that preserves the snapshot identity. Redact credentials from config dumps and logs. Prometheus remote write remains a separate sink and must keep its own health signal.
• Billing ingestion MUST be idempotent. Use a deterministic event/checkpoint identity, reject or safely ignore duplicate snapshots, and persist the resulting ledger/quota state in the shared PostgreSQL database. Schema initialization and migrations MUST be idempotent and deployed before the reader path is enabled.
• Accounts is the aggregation/read API over that shared database. Portal MUST read usage through Accounts rather than querying PostgreSQL or Billing directly. A Portal value of zero is not proof of zero traffic until the upstream ingest, ledger, and Accounts query checkpoints have been verified.

The release evidence MUST distinguish these checkpoints:

Do not close a release from a green deployment job alone. A service being active proves process health, not data flow. Record the release tag, expected source SHA, deployment run, target environment, and each checkpoint's timestamp in the repository's task/progress record.

8.2 CI and CD must be separate

CI establishes whether a revision is safe to promote; CD changes a managed environment. They MAY share reusable scripts or callable workflows, but MUST remain separate workflow boundaries, permissions, and success criteria.

• A CI workflow MUST NOT apply Terraform, mutate cloud resources, alter DNS, run production Ansible, or obtain deployment credentials. A green CI result is eligibility evidence, not a deployment claim.
• A CD workflow MUST consume an immutable artifact identity produced or approved by CI (digest, version, signed manifest, or plan artifact). Do not checkout an unconstrained branch tip and rebuild during deployment; that breaks the proof that was tested.
• Pass only explicit, typed promotion inputs across the boundary: revision SHA, artifact identity, target environment, approved action, and a correlation ID. Validate them at the CD entry point and record them in the deployment summary.
• Do not run untrusted pull-request code in a privileged context. In particular, pull_request_target and reusable workflows with deployment permissions need a reviewed, immutable caller/ref and must never execute PR-supplied scripts.
• Keep a separate deploy gate from the CI gate. Environment approval, concurrency, preflight, health checks, rollback, and post-deploy verification belong to CD; test/lint failures belong to CI. A CD workflow can call a narrow validation script, but must not be reported as “CI passed” if it skipped deployment.

9. Deploys must fail on no-op (no false green)

A green check must mean the remote state actually changed. The most dangerous CI defect is the false green: a "deploy" step exits 0 having done nothing, so a broken environment ships behind a wall of ✓s. Design every mutating step so that doing nothing is an error.

• Ansible matches zero hosts → exit 0. Both ansible (ad-hoc) and ansible-playbook --limit print No hosts matched / provided hosts list is empty and still succeed. A wrong inventory path or a mistyped host name then makes the whole deploy a silent no-op. Assert reachability before the mutating calls, via a shared guard:

  # common_assert_ansible_host.sh <inventory> <host> — fails red on missing
  # inventory file, no host match, or unreachable host.
  ping_out="$(ansible -i "${inventory}" "${host}" -m ping 2>&1 || true)"
  echo "${ping_out}"
  grep -q 'SUCCESS' <<<"${ping_out}" \
    || { echo "::error::'${host}' matched no reachable host in ${inventory}"; exit 1; }

• Artifact paths are relative to the repo root, but the step's cwd may not be. download-artifact with path: cmdb lands at <repo-root>/cmdb; a step with working-directory: playbooks must reach it as ../cmdb/inventory.ini, not cmdb/inventory.ini. Pick one convention per job and apply it to every script the job calls — a single stale path silently degrades to the no-op above. When cwd is ambiguous, prefer ${GITHUB_WORKSPACE}/… absolute paths.
• set -e is not enough. Use set -euo pipefail so unset secrets and broken pipes also fail. set -e will not catch a tool that itself exits 0 on an empty target — that is exactly what the reachability guard is for.
• Verify the effect, not just the exit code. A step that claims to change remote state should confirm it did — host matched, container Up, file present, migration row written — rather than trusting a 0. Prefer ansible-playbook (task-level changed/failed accounting) over ad-hoc ansible -m command for anything non-trivial.
• Guard the matrix, then guard inside. []/0 matrix defaults (§5) stop a job from running on an empty fleet; the reachability assert stops a job that did run from lying when its target resolved to nothing. You need both.
• An empty variable is not an error to the tool that receives it. Variables that select a target or carry a credential fail silently when blank: an empty ansible host pattern or --limit matches zero hosts and exits 0; vault-action with ignoreNotFound turns a renamed key into "", so docker login runs with an empty password and a Terraform backend gets region="" and dies several steps later, far from the cause. Assert them at the script's entry point rather than hoping a downstream command objects:

  require_env() {           # shared helper, sourced by every mutating script
    local missing=() v
    for v in "$@"; do [ -z "${!v:-}" ] && missing+=("$v"); done
    [ ${#missing[@]} -gt 0 ] && { echo "::error::missing: ${missing[*]}" >&2; exit 1; }
  }
  require_env MATRIX_HOST POSTGRES_ROOT_PASSWORD

  List only variables used unconditionally — making genuinely optional ones mandatory just to satisfy an audit trades one wrong behaviour for another.

10. Job gating must be falsifiable

A job that reports skipped looks identical whether it was deliberately not requested or is structurally incapable of running. That ambiguity hides broken gating indefinitely.

• A skip propagates down the whole needs chain, and always() only stops it for the job that carries it. If an early job is skipped and the next one runs only because its condition starts with always(), that job's success does not clear the skip for anything downstream: the next job's if is never evaluated at all. The symptom is a job whose condition is correct in every operand yet reports skipped forever — so the operands get audited over and over while the actual defect is a missing always(). Every job downstream of an always() job needs its own always(), paired with an explicit needs.<upstream>.result == 'success' — catching the skip must not also make the job run after a real upstream failure.
  • Diagnostic: compare a step-level and a job-level read of the same output. If a step gated on steps.<id>.outputs.X == 'true' ran, but a downstream job gated on needs.<job>.outputs.X == 'true' skipped, the value is fine and the propagation is not. Equivalently, if exactly the jobs carrying always() ran and exactly those without it skipped, the conditions are not what is being tested.
• needs.<job> for a job absent from that job's needs: list evaluates to empty. '' == 'success' is false, so the whole && chain is false and the job never runs — no error, just a permanent skipped. Referencing a job that no longer exists at all does the same thing. Audit that every needs.<x> in an if: is both declared in needs: and defined in the workflow.
• Distinguish "not requested" from "cannot run". If a job is gated on an input, check the history: a job that is skipped on every run, including ones where the input was set, is not being skipped for the reason you think.
• Conditions that coincide with the intent are still bugs. A gate that evaluates false for the wrong reason can match the desired behaviour on the common path and diverge on every other one — e.g. a data-migration job whose needs.provision.outputs.* silently resolve to empty still skips correctly on deploy runs, and never runs at all on migrate runs.

11. Trigger scope

Triggers decide what a workflow costs and what it can damage. Both are easy to get wrong in the direction of "more".

• A bare push: fires on every branch. on: push: with no branches/paths runs for every push in the repo. When the sibling pull_request: block carries a paths: filter it is easy to misread as covering both — the filter applies only to the event it sits under.
• State the blast radius of pull_request. If the PR route runs terraform apply rather than plan, every pull request provisions real infrastructure that nothing tears down. Gate deploy jobs on the action (terraform_action == 'apply') so routing a PR to plan disables them without touching their conditions.
• Path filters must cover every input the job consumes. A filter naming only workflows/<x>.yaml and scripts/<x>_* will silently skip the pipeline when a shared common_* script changes. Narrowing a deploy trigger is the same hazard class as §9: the run does not fail, it does not happen. Verify the filter against the actual set of files the job reads.
• paths combined with a tag trigger is unreliable. Do not add one to a release path without verifying tag pushes still run.

12. Before opening a PR

Run bash -n against the provider adapter's touched scripts and confirm gitleaks passes. Branch names and PR targets follow project-development-standard.

13. AI Workspace Infra workflow rules

• In platform-ops-toolkit, keep non-trivial control-plane logic in executable .github/scripts/ files. Workflow run: entries invoke scripts; pass values via env:. Put host/database execution in its owning reusable playbook role (§14), then validate touched scripts with bash -n, parse touched YAML, and run the workflow's existing PR gate.
• Keep the domain-delivery sequence intact: render topology → Terraform → generate CMDB/inventory → upload/download CMDB artifact → Ansible. A replacement instance must be adopted into the original Terraform state before inventory generation.
• A normal terraform apply must reject a provider-incompatible plan change such as a Vultr in-place downgrade, then route the operator to an explicitly confirmed replacement workflow. Never hide provider errors with retries.
• New OIDC/Vault workflow files are a two-part change: workflow code plus the exact managed job_workflow_ref allowlist update. Verify both before dispatch.
• Scope concurrency by the actual mutable resource (environment and instance for resize; environment/domain for delivery). Do not cancel an in-progress stateful migration merely because a new run was requested.
• In artifacts, many existing image/chart workflows predate this layout. Make focused compatibility changes and audit paths filters against Dockerfiles, chart dependencies, and scripts actually consumed by the job.

13. Environment variable layering — define once, at the highest valid scope

Repeated env: blocks are a maintenance hazard: each copy is a place the next rename, secret rotation, or typo fix will be forgotten. Place every variable at the highest scope where all its inputs are available, and never lower.

Rules

1. A variable that appears in ≥2 steps of the same job MUST be hoisted. If two steps both set AWS_ACCESS_KEY_ID, one of the layers above is wrong.
2. Job-level env: is illegal on uses: (reusable workflow) jobs. GitHub Actions rejects env: alongside uses: at the job level. Only with: and secrets: are valid there. The called workflow defines its own env:.
3. runs-on: is illegal on uses: jobs. The runner is defined inside the called workflow. Adding runs-on: to a job with uses: causes a schema validation error at queue time.
4. GITHUB_ENV does not cross job boundaries. Each job runs on a fresh runner. Pass values between jobs via outputs: on the producing job and needs.<job>.outputs.<key> on the consuming job.
5. Prefer GITHUB_ENV over per-step env: for Vault outputs. A single "Export credentials" step after vault-action is clearer and smaller than repeating the same 5 keys across 3–4 Terraform steps.
6. Comments replace removed env: blocks. When hoisting removes a step's env:, leave a brief # KEY from job env or # KEY from GITHUB_ENV comment so reviewers can trace the source without scrolling.

Anti-pattern: the "looks right, deploys wrong" empty variable

vault-action with ignoreNotFound: true turns a renamed or missing key into an empty string. An empty AWS_ACCESS_KEY_ID doesn't fail — it authenticates as anonymous and either silently succeeds (public bucket) or fails several steps later with a confusing error. The GITHUB_ENV export step is the right place to add an assertion:

- name: Export Terraform credentials
  run: |
    : "${TF_STATE_ACCESS_KEY:?Vault key TF_STATE_ACCESS_KEY is empty}"
    echo "AWS_ACCESS_KEY_ID=${TF_STATE_ACCESS_KEY}" >> "$GITHUB_ENV"
    ...
  env:
    TF_STATE_ACCESS_KEY: ${{ steps.vault.outputs.TF_STATE_ACCESS_KEY }}

14. Cross-repository ownership — orchestration is not execution

platform-ops-toolkit owns the delivery control plane: environment selection, immutable artifact provenance, approvals, phase ordering, dispatch, and release evidence validation. It may orchestrate Terraform, CMDB, migration and DNS work, but the workflow itself MUST NOT implement database backup/restore, schema changes, host bootstrap, or application deployment. Those operations belong to the repository that owns the resource or execution mechanism.

Boundary contract

Delegation pattern

# <orchestrator-repo>/.github/workflows/<delivery>.yaml
deploy_<domain>:
  needs: provision
  if: ${{ ... && needs.provision.outputs.hosts_<domain> != '[]' }}
  strategy:
    matrix:
      host: ${{ fromJSON(needs.provision.outputs.hosts_<domain>) }}
  uses: <org>/<playbooks-repo>/.github/workflows/<domain>-domain-cd.yaml@<ref>
  with:
    target_host: ${{ matrix.host }}
    deploy_env:  ${{ needs.provision.outputs.deployment_env }}

Constraints

• No runs-on: on uses: jobs. The reusable workflow declares its own runner.
• No env: on uses: jobs. Pass configuration via with: inputs only.
• No steps: on uses: jobs. The reusable workflow owns all step logic.
• Vault roles for playbooks must be provisioned. The orchestrator's Vault bootstrap must create a github-actions-<playbooks-repo>-{env} role per environment, with job_workflow_ref pinned to that repo's CD workflow files.

Where the domain list lives

Which domains exist, which services each owns, and which playbook bootstraps them are facts about a specific platform, not part of this spec. They change as the business evolves; pinning them here would make the spec stale and non-reusable.

Keep that mapping as a delivery manifest in the consuming repository — one table with domain, owning services, where CI builds them, and the CD entry point. This spec only fixes the shape: one delegating job per domain, matrix-fed from the provisioner's per-domain host list, calling that domain's reusable CD workflow.

The orchestrating workflow must not grow per-service steps. A new service belongs to an existing domain's CD workflow; a new domain gets one more delegating job.

Release execution ownership across the infra repositories

For a new or substantially changed UAT/PROD upgrade path, resolve each change to one owner before editing. This is a required review boundary, not a request to move unrelated legacy files during a focused fix. Apply the boundary by role when repository names differ; do not create an extra repository just to match this example.

Before adding a script under platform-ops-toolkit/.github/scripts/, verify that its behavior is control-plane-only. An entrypoint that must run pg_dump, psql for a mutation, pg_restore, ssh to change a host, or a provider deployment command is execution logic: put host/database work in a shared playbooks role, provider resource work in iac_modules, and telemetry-specific work with its Observability owner. Toolkit retains its GitOps reader/validator and indispensable control-plane adapters. Keep adapter scripts thin and parameterized by environment, phase, immutable release, reviewed database version/checksum, and CMDB target. Do not create a separate copy for UAT, PROD, and each service when one role can validate those inputs.

Put actual backup bytes only on the environment-authorized storage target; the toolkit receives a non-sensitive checkpoint ID, source/restore identity, version and verification result. The role must verify these facts through the remote system before emitting a receipt. The toolkit rejects a missing, skipped, mismatched or unreviewed receipt. A boolean supplied by the caller is not evidence that a backup restored, a migration ran, or a user could log in. Use GitOps/CMDB to resolve the host and IaC facts to verify the storage mount. Never infer actual traffic direction solely from the intended topology; check the applied configuration before choosing the database to migrate.

Ship a cross-repository release change in dependency order: IaC capacity and GitOps desired state when needed, then the playbooks execution contract, then the toolkit orchestrator. CI in each owner repository tests its own behavior. Only after the reviewed dependencies are available may the toolkit enable the live UAT phase. A missing phase implementation is a blocked release, not a successful no-op.

When consolidating or renaming workflow entries, migrate every caller, reusable-workflow input, permission boundary, Vault job_workflow_ref allowlist, contract test and operator runbook before deleting the old entry. Make legacy data imports an explicit UAT-only operation rather than a side effect of an ordinary upgrade. A renamed YAML file alone is not a working migration or evidence of safe execution.

15. Environment resolution — keep the expression simple

Environment routing (SIT/UAT/Prod) uses a single expression pattern repeated across DEPLOY_ENV, VAULT_ENV_PATH, VAULT_ROLE, and all VAULT_KV_* paths. Write it once in its simplest form and repeat identically — never expand it with redundant conditions.

Canonical expression

${{ github.event_name == 'pull_request' && 'sit'
 || startsWith(github.ref, 'refs/tags/v') && 'prod'
 || github.event.inputs.vault_env_path
 || 'uat' }}

Rules

1. Three cases, one fallback. PR → sit, tag → prod, dispatch input → user's choice, everything else → uat. Do not add github.event_name == 'push' guards — main and release/* pushes naturally fall through to 'uat'.
2. Identical expression in every use. DEPLOY_ENV, VAULT_ENV_PATH, VAULT_ROLE suffix, VAULT_KV_BASE suffix, VAULT_KV_DATABASES infix, and VAULT_KV_AGENT_PROXY infix must all use exactly the same expression. A divergence means one path resolves uat while another resolves prod.
3. No nested parentheses. GitHub Actions expression evaluation is left-to-right with && binding tighter than ||. The short-circuit form A && 'x' || B && 'y' || C || 'z' is correct without grouping.
4. workflow_dispatch input takes precedence over branch. When an operator dispatches from main with vault_env_path=sit, the input wins (it appears before the 'uat' fallback). This is intentional — dispatch is explicit.

Feature-scoped pre-merge acceptance

Use feature-lane-release-workflow for multi-repository PR candidates tested before main. Keep PR builds separate from credentialed deployment; validate the immutable manifest through a trusted non-production orchestrator. Serialize mutations by feature/target, reject stale revision promotions, and do not cancel a partially mutating operation without a recovery receipt. UAT freezes the deployed candidate; new revisions invalidate affected acceptance evidence. Environment routing changes remain subject to the multi-environment standard.