feat: Implement GitHub Artifact Attestations for Helm Chart Signing #98
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xiangyisss
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…n chart release workflow
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This PR has packaging + attestations but no traditional signing. This is the intended design - GitHub Attestations replace GPG signing with a more modern, keyless approach using Sigstore infrastructure.
✅ Packaging - helm package charts/exivity -d .cr-release-packages
✅ Attestations - actions/attest-build-provenance@v1 with subject-path
❌ Traditional Signing - No GPG signing (intentionally removed)
Note: This workflow does NOT include traditional GPG signing (helm package --sign).
https://docs.github.com/en/actions/concepts/security/artifact-attestations#how-github-generates-artifact-attestations
CLOSE-EXVT-5947