Pin shared reusable workflows to a commit SHA

[bharvey88]

Version: unchanged (workflow only)

What does this implement/fix?

Pins the two ApolloAutomation/Workflows reusable workflow references (build, label-check) from the mutable @main ref to the current reviewed commit SHA, matching how the repo already pins third-party actions. A change to the Workflows repo would otherwise silently change what runs here.

MTR-1's ci.yml, autoassign.yml, and weekly.yml are inline and do not reference the shared Workflows repo, so only these two files change. (AIR-1 #118 pinned five refs because its equivalents call the shared repo.)

Trade-off: future Workflows updates need a pin bump in this repo.

Replicates ApolloAutomation/AIR-1 #118.

Types of changes

• Bugfix (fixed change that fixes an issue)
• New feature (thanks!)
• Breaking change (repair/feature that breaks existing functionality)
• Dependency Update - Does not publish
• Other - Does not publish
• Website of github readme file update - Does not publish
• Github workflows - Does not publish

Checklist / Checklijst:

• The code change has been tested and works locally
• The code change has not yet been tested

If user-visible functionality or configuration variables are added/modified:

• Added/updated documentation for the web page

🤖 Generated with Claude Code

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Review details

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro Plus

Run ID: 7c1e653f-916a-4d20-a797-93970e9af057

📥 Commits

Reviewing files that changed from the base of the PR and between 6b91614 and dce1c38.

📒 Files selected for processing (2)

• .github/workflows/build.yml
• .github/workflows/label-check.yml

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch fix/pin-workflows-sha

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