fix(ci): pin reusable-workflow @main refs to SHA

[castrojo]

Summary

Consistency audit C2: pin all @main reusable-workflow refs to the current projectbluefin/actions main HEAD SHA.

Files updated (clean branch from main):

• .github/workflows/execute-release.yml (2 refs)
• .github/workflows/pr-release-gate.yml (1 ref)
• .github/workflows/promote-testing-to-main.yml (1 ref)
• .github/workflows/release-reminder.yml (1 ref)

SHA pinned: 7f79969c2ff74c51ac7f385cb0a86414975308d7 (actions main HEAD as of 2026-06-10)

Renovate will keep these SHAs current going forward via the C3 grouping rule added in common.

Supersedes #784 (same change, clean branch from main — no conflicts).

Closes automation-audit C2 for dakota.

Assisted-by: Claude Sonnet 4.5 via pi

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro Plus

Run ID: 9ff5b6af-922c-43d3-be0f-5c2a03df4415

📥 Commits

Reviewing files that changed from the base of the PR and between 5377a93 and dd488d2.

📒 Files selected for processing (4)

• .github/workflows/execute-release.yml
• .github/workflows/pr-release-gate.yml
• .github/workflows/promote-testing-to-main.yml
• .github/workflows/release-reminder.yml

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch fix/c2-pin-main-refs-v2

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[github-actions]

Thanks for the PR! A maintainer will review it.

While you wait, make sure these pass locally:

just validate        # element graph check
just build default   # build the image
just boot-test       # confirm the desktop boots (exits 0 = pass)
just lint            # bootc container lint

If this PR fixes a bug, add verify steps to the linked issue so users can confirm the fix on their hardware after the next nightly ships:

```verify
ujust <something>   # what users should run to confirm the fix
```