ci: add permissions and pin action SHAs (22 workflows)#455
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Add `permissions: read-all` at the workflow level to enforce least-privilege for all jobs, and pin all third-party action references to full commit SHAs to prevent supply-chain attacks via mutable version tags or branch names.
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Summary
CI workflows are missing top-level `permissions` declarations and reference actions by mutable tags/branch names — both are supply-chain risk vectors.
Changes:
Mutable action references (`@v4`, `@master`, etc.) allow a compromised upstream to inject arbitrary code into your CI. Pinning to a commit SHA ensures only the audited revision runs regardless of upstream changes.