Pin GitHub Actions to commit SHAs; add Dependabot config#87
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Per #85: pin third-party GitHub Actions to immutable commit SHAs (with a trailing version-tag comment for human readability) to mitigate supply-chain attacks via tag re-pointing. Add a Dependabot config that maintains the github-actions ecosystem with a 7-day cooldown so we don't adopt brand-new releases until any yanks/revocations have surfaced. Each workflow has a header comment explaining the SHA-pinning convention and linking to the GitHub security-hardening docs and the mheap/pin-github-action tool. Versions chosen are the latest stable that are also more than 7 days old (verified against each repo's official Releases page on 2 Jun 2026): - actions/checkout: v4 -> v6.0.2 (de0fac2, released 2026-01-09) - v6.0.3 was released today and skipped per the cooldown policy. - actions/setup-python: v5 -> v6.2.0 (a309ff8, released 2026-01-22) - actions/cache: v4 -> v5.0.5 (27d5ce7, released 2026-04-13) Closes #85
mbarton
approved these changes
Jun 3, 2026
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Per #85: pin third-party GitHub Actions to immutable commit SHAs (with a trailing version-tag comment for human readability) to mitigate supply-chain attacks via tag re-pointing. Add a Dependabot config that maintains the github-actions ecosystem with a 7-day cooldown so we don't adopt brand-new releases until any yanks/revocations have surfaced.
Each workflow has a header comment explaining the SHA-pinning convention and linking to the GitHub security-hardening docs and the mheap/pin-github-action tool.
Versions chosen are the latest stable that are also more than 7 days old (verified against each repo's official Releases page on 2 Jun 2026):
Closes #85
Based on
liveso can be merged ahead of #80 and subsequent PRs without causing too much mayhem.