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Re-submission of #3544. Had a problem with my fork and had to delete it, which closed the original PR. Apologies for the noise.
Summary
This PR pins a GitHub Action to an immutable commit SHA instead of a mutable branch reference.
Yikun/hub-mirror-action@masterto full 40-character SHAHow to verify
Review the diff, the change is mechanical and preserves workflow behavior:
action@masterbecomesaction@abc123 # master, original ref preserved as commentI've been researching CI/CD supply chain attack vectors and submitting fixes to affected repos. Based on that research I built a scanner called Runner Guard and open sourced it here so you can scan yourself if you want to. I'll be posting more advisories over the next few weeks on Twitter if you want to stay in the loop.
If you have any questions, reach out. I'll be monitoring comms.
- Chris (dagecko)