ci: pin GitHub Actions to commit SHAs#4
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Overview
Pins all third-party GitHub Actions references to full commit SHAs with version comments.
Problem Statement
Floating tags like
@v6are mutable: a compromised or retagged release can silently execute arbitrary code in CI with access to repo secrets and theGITHUB_TOKEN. This matches GitHub's hardening guidance and recent supply-chain incidents (e.g. tj-actions).Solution Approach
actions/checkout@v6tode0fac2e...(v6.0.2) acrossdeploy-docs,lint,publish,typecheckactions/setup-node@v6to48b55a01...(v6.4.0) inprepare-runnercomposite andpublishactions/upload-pages-artifact@v3tofc324d35...(v5.0.0) andactions/deploy-pages@v4tocd2ce8fc...(v5.0.0)# vX.Y.Ztrailing comments so Dependabot can keep them currentBreaking Changes
None.