ci: pin GitHub Actions to commit SHA for security #790
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Pin all GitHub Actions to specific commit SHAs instead of mutable tags to prevent supply chain attacks through: - Malicious commits to existing tags - Tag hijacking/deletion - Upstream repository compromise Actions pinned: - actions/checkout: v2.7.0 -> ee0669bd1cc54295c223e0bb666b733df41de1c5 - actions/cache: v4.3.0 -> 0057852bfaa89a56745cba8c7296529d2fc39830 - actions/setup-java: v1.4.4 -> b6e674f4b717d7b0ae3baee0fbe79f498905dfde - actions/upload-artifact: v4.6.2 -> ea165f8d65b6e75b540449e92b4886f43607fa02 Version comments added above each action for maintainability. Dependabot can automatically update these SHAs when new versions are released. Fixes ACINQ#716 Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
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Summary
Motivation
Using version tags for GitHub Actions introduces security risks:
Pinning to commit SHAs ensures the exact code that was audited continues to run.
Changes
ee0669bd1cc54295c223e0bb666b733df41de1c50057852bfaa89a56745cba8c7296529d2fc39830b6e674f4b717d7b0ae3baee0fbe79f498905dfdeea165f8d65b6e75b540449e92b4886f43607fa02Test plan
Fixes #716
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