Pin GitHub Actions to full-length commit SHAs#9
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Summary
This PR pins GitHub Actions to full-length commit SHAs for improved security and reproducibility.
Why?
Pinning actions to commit SHAs prevents supply-chain attacks where a tag could be moved to point to malicious code. This is a recommended security best practice per the GitHub Actions security hardening guide.
What changed?
All third-party action references in
.github/workflows/have been updated from tag-based references (e.g.,actions/checkout@v4) to SHA-pinned references with a version comment (e.g.,actions/checkout@<sha> # v4).Is this safe to merge?
Yes. The pinned SHAs correspond to the same commits that the existing tags pointed to. No behavioral changes are introduced.
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