Factory Operations Skill#

Covers systems that keep the projectbluefin factory safe:

1. Production gate - machine-enforced 2-human approval before any build reaches :stable
2. Promotion cadence - per-repo schedule, use_merge_queue contract, and run_e2e rationale
3. Factory health monitor - scheduled pipeline health monitoring with automatic issue creation
4. Renovate auto-merge - automated dependency bump management

1. Production Gate (Track C-1)#

What it is#

A GitHub Environment named production added to the promotion job in each image repo's release workflow. GitHub blocks the job until the required number of distinct human approvers click Approve in the Environments UI.

Where it lives#

Workflow snippet#

jobs:
  promote:
    runs-on: ubuntu-latest
    environment:
      name: production
      url: https://ghcr.io/projectbluefin/bluefin:stable
    steps:
      - # ... SHA-lock + verify-e2e + skopeo copy ...

Manual GitHub UI setup (one-time per repo)#

After the workflow change is merged:

1. Go to the repo → Settings → Environments → New environment
2. Name: production
3. Set Required reviewers - list the 4 maintainers (castrojo, p5, m2Giles, tulilirockz)
4. Set the required count to 2 (two distinct approvals)
5. Restrict to the main branch

Verification#

• Trigger the promotion workflow via workflow_dispatch
• Confirm the job pauses with a yellow "Waiting for approval" status
• One reviewer approves → job stays paused
• Second reviewer approves → job runs
• Author approving their own dispatch is blocked (GitHub prevents self-approval when ≥1 review required)

What it does NOT prevent#

Repo admins can bypass Environment rules. All bypasses are permanently visible in:

• gh api repos/<org>/<repo>/deployments - every deployment record
• The Environment's deployment history page in GitHub UI

The protection is friction-ful for accidental/casual bypasses, not cryptographically airtight. This is the appropriate bar for a trusted team of 4.

2. Promotion Cadence and Merge Queue Contract#

Each consumer repo promotes :testing → :stable (or :lts) via a thin caller to
reusable-promote-squash.yml@v1. The cadence and merge-queue behavior differ per repo — this
section is the canonical reference so edits to consumer promote-testing-to-main.yml preserve
the contract.

Per-repo schedule and inputs#

Conditional merge-queue enrollment (dakota pattern)#

Dakota passes use_merge_queue as an expression rather than a constant:

use_merge_queue: ${{ github.event_name == 'schedule' || github.event_name == 'workflow_dispatch' }}

This enrolls the PR in the merge queue only when triggered by a scheduled run or manual dispatch
(the weekly release path), not when triggered by a push to the source branch (routine refresh).
Enqueue on every push would cause the merge queue to process unnecessary entries.

Why use_merge_queue matters#

enablePullRequestAutoMerge (the GraphQL mutation for standard auto-merge) is blocked by GitHub
when the target branch has a merge queue ruleset enabled. Calling it silently fails.
enqueuePullRequest (the alternative used when use_merge_queue: true) places the PR directly
in the queue, where the queue runner merges it once all required checks pass.

If you add a merge queue ruleset to a repo's target branch, set use_merge_queue: true
(or the conditional expression above if you want queue-only on weekly runs).

Why run_e2e: false#

E2E evidence is gathered out-of-band by post-testing-e2e.yml (bluefin) or at the
environment: production approval gate level (dakota). The promotion PR gate runs cosign
signature verification only — it does not re-trigger E2E. Setting run_e2e: true at the
promotion step would duplicate the gate and create a dependency on testsuite availability
during the promotion window.

3. Factory Health Monitor#

What it is#

A scheduled workflow (actions/.github/workflows/factory-health.yml) that checks the last 24 hours of
critical factory pipelines and opens an issue in projectbluefin/common when any monitored pipeline
falls below the success-rate threshold.

Schedule#

cron: '0 */6 * * *' - every 6 hours. Also triggerable via workflow_dispatch.

Monitored pipelines#

Alerting behavior#

• Success rate = successful completed runs / completed non-skipped runs
• Window = last 24 hours
• Threshold = 80%
• Open issues are deduplicated by repo + pipeline title prefix
• Issues are filed in projectbluefin/common with the labels that currently exist from:
  priority/p0, area/ci, kind/bug

Authentication pattern#

Use the workflow github.token for read-only gh run list calls against the public factory repos.
Generate a GitHub App token scoped to projectbluefin/common before creating issues there. This keeps
cross-repo issue writes explicit while avoiding broader write scopes for routine monitoring.

Output#

The workflow always prints a markdown summary table to stdout and $GITHUB_STEP_SUMMARY, even when no
issues are opened.

4. Renovate - Automated Dependency Maintenance#

What it does#

Renovate runs as the MergeRaptors GitHub App and opens PRs to bump pinned action SHAs and digests. Qualifying PRs auto-merge when CI passes - no human review needed.

Config#

Two files co-exist:

• .github/renovate.json5 - base org config (inherited from projectbluefin/renovate-config)
• renovate.json - repo-level overrides, including the packageRules automerge block

The effective automerge rule in renovate.json:

{
  "packageRules": [
    {
      "description": "Automerge chore dep updates (digest, pin, patch, minor) when CI passes",
      "matchUpdateTypes": ["digest", "pin", "patch", "minor"],
      "automerge": true,
      "automergeType": "pr",
      "automergeStrategy": "squash"
    }
  ]
}

What auto-merges: SHA digest bumps, pin updates, patch and minor version bumps - when all CI checks pass. These are safe to auto-merge because they carry no behavior change.

What never auto-merges: Major version bumps and any PR that fails CI.

Consumer-validation exemption: Renovate PRs (author login ending in [bot] or starting with app/) are automatically exempt from the consumer PR + CI run evidence requirement, even when they touch action files. See docs/skills/consumer-validation.md.

Validation workflow#

.github/workflows/validate-renovate.yml runs renovate-config-validator --strict on PRs and pushes that touch either Renovate config file. Changes that fail validation are caught before merging.

Auto-merge repo setting#

The repository has allow_auto_merge: true enabled. Without this, GitHub ignores the automerge setting regardless of config.

Relationship to @v1#

Renovate keeps SHA pins current for third-party actions in this repo. Consumers don’t see the updates until a maintainer advances the @v1 tag. See the @v1 runbook in AGENTS.md for the exact commands.

Troubleshooting#

5. Promotion PR Format (Design C)#

Every testing → stable promotion PR in bluefin and dakota uses a consistent
“Design C” body generated by scripts/render_pr_body.py.

Title format#

ci(promote): <primary-image> testing → stable YYYY-MM-DD

Examples: ci(promote): bluefin testing → stable 2026-06-11

Body structure#

## 🦕 Bluefin testing → stable · 2026-06-11

> **12 days since the last stable release** · [tag ↗](release-url)
> Auto-maintained · Updated ISO-timestamp · [Run ↗](run-url)

<!-- gate-section-start -->
### Release checklist
**✅ All checks passed**
| Check | Status | Details |
|---|---|---|
| Digest resolution | ✅ passed | ... |
| Cosign signatures | ✅ passed | ... |
| E2E | ✅ passed | ... |
<!-- gate-section-end -->

### Variants being promoted
(variants table with digests when available)

### Changes since last stable
(commit count + collapsible commit log — squash workflow only)

## Desktop Screenshot

> [!CAUTION]
> **Auto-merge scheduled for Tuesday 04:00 UTC (bluefin/dakota) / Thursday 04:00 UTC (bluefin-lts).**
> To block this release: add the `do-not-merge` label to this PR before that time.
> Remove the label when the issue is resolved -- the next weekly window will pick it up automatically.

![bluefin desktop](https://projectbluefin.github.io/testsuite/screenshots/bluefin-smoke-latest.png)

The gate checklist starts with ⏳ placeholders written by the promote job,
then the gate job replaces only the <!-- gate-section-start/end --> block
with live ✅/❌ results via scripts/render_gate_section.py.

Promotion PRs must carry the screenshot + caution block in the body, not a
separate GitHub comment. If the PR is labelled do-not-merge, the reusable
workflow skips auto-merge / merge-queue enrollment until the label is removed.

Scripts#

Consumer repo branch targets#

bluefin-lts uses a different release model (weekly direct builds on lts branch, no promotion PR).
Tracked in bluefin-lts#172.

6. Promotion and sync-branches known patterns#

enqueuePullRequest vs enablePullRequestAutoMerge#

For repos with a merge queue enabled, enablePullRequestAutoMerge is blocked by GitHub.
Use the enqueuePullRequest GraphQL mutation instead:

gh api graphql \
  -f query='mutation($id:ID!){enqueuePullRequest(input:{pullRequestId:$id}){mergeQueueEntry{id}}}' \
  -f id="$(gh pr view <PR> --json id -q .id)"

reusable-promote-squash.yml uses this pattern when enabling auto-merge on promotion PRs.

E2E gate must use source_branch HEAD SHA — not a hardcoded ref#

The promote-squash workflow queries the E2E gate against the source_branch HEAD SHA
(e.g. testing HEAD), not a hardcoded main or the caller's github.ref:

# Correct — lock to the branch that the E2E workflows ran against
SHA=$(gh api repos/$REPO/git/ref/heads/$E2E_HEAD_BRANCH --jq '.object.sha')

Using a hardcoded branch or github.ref can match a more-recent commit that hasn't had
E2E run yet, silently allowing un-tested code through the promotion gate.

Force-push guard: skip when squash tree is unchanged#

Before force-pushing the squash branch to an existing promotion PR, compare the squash tree
to the PR's current HEAD. If they match, skip the force-push entirely — force-pushing an
identical tree dismisses reviewers' approvals for no reason:

SQUASH_TREE=$(git rev-parse HEAD^{tree})
REMOTE_TREE=$(git ls-remote origin "refs/heads/$BRANCH" | cut -f1 | xargs git cat-file -p | grep tree | cut -d' ' -f2)
[ "$SQUASH_TREE" = "$REMOTE_TREE" ] && echo "no-op, skipping force-push"

reusable-sync-branches: optional GH_TOKEN + force-reset for diverged branches#

reusable-sync-branches.yml merges source_branch into target_branch after a promotion.
Two patterns to know:

Protected branches: The workflow accepts an optional GH_TOKEN secret from the caller.
When provided, it uses a GitHub App token to bypass protected-branch push rules. Without it,
github.token is used — which fails on protected branches.

Diverged target: If the target branch has commits not in source (e.g. direct CI fixes on
main while testing was being promoted), the workflow force-resets target to source
instead of attempting a merge. This is safe because:

• main only receives CI fixes that don't need cherry-picking
• A failed merge leaves the pipeline broken indefinitely
• Force-reset produces a clean, predictable state

How the Systems Work Together#

Factory health monitor runs every 6 hours
  └─▶ success rate < 80%
        ├── no open alert issue → opens issue in projectbluefin/common
        └── open alert issue exists → logs and skips duplicate creation

Renovate detects stale SHA pin
  └─▶ Opens bump PR
        ├── CI (actionlint) passes → auto-merges
        └── CI fails → stays open for human review

Batch of Renovate bumps land on main
  └─▶ Maintainer runs: git tag -f v1 origin/main && git push --force origin v1
        └─▶ All consumer repos pick up updated SHA pins on next workflow run

Renovate keeps pins fresh automatically; the factory health monitor surfaces failing pipelines quickly; and the production gate plus @v1 human authorization keep consumers safe.

Troubleshooting#