Add commit signature verification before source build - #6
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When prebuilt binaries are unavailable, verify the source commit's GPG signature before falling back to cargo install. This prevents building from a compromised repository and closes a supply-chain attack vector. The verification step: - Fetches the commit object from the remote repository - Uses git verify-commit to validate the GPG signature - Fails with a clear error if the commit is unsigned or verification fails - Requires that git has access to the signer's public key Also adds platform support documentation and CI tests for both signed and unsigned commit verification, plus musl target selection for prebuilt artifacts.
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Verify the postil-cli commit's GPG signature before falling back to cargo install when prebuilt binaries are unavailable. This prevents building from a compromised repository.
The verification step fetches the commit object and uses git verify-commit to validate the signature, failing with a clear error if verification fails. The runner must have access to the signer's public key (e.g., imported from a keyserver).
Includes CI tests for both signed commits (should pass) and unsigned commits (should fail).