fix(ci): add SLSA provenance to release artifacts#243
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The OpenSSF Scorecard Signed-Releases check awards 8/10 for sigstore signatures (.sigstore.json) but requires .intoto.jsonl provenance files for 10/10. Add the slsa-framework/slsa-github-generator generic workflow to generate SLSA v1.0 provenance and upload it to each GitHub Release. The existing actions/attest-build-provenance steps are kept for GitHub Artifact Attestations (gh attestation verify). The new SLSA generator adds .intoto.jsonl files that the Scorecard recognizes as provenance. Signed-off-by: Rhuan Barreto <rhuan.barreto@gmail.com>
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Summary
slsa-framework/slsa-github-generatorgeneric workflow torelease-binaries.ymlcombine-hashesjob merges them; theprovenancejob calls the SLSA reusable workflow which generates.intoto.jsonland uploads it to the GitHub Releaseactions/attest-build-provenancesteps are kept — they feed GitHub's Artifact Attestations API (gh attestation verify), while the new.intoto.jsonlfiles satisfy the OpenSSF Scorecard's Signed-Releases provenance tier (10/10 vs current 8/10)Context
OpenSSF Scorecard currently gives 8/10 on Signed-Releases: all 5 latest releases have
.sigstore.jsonsignatures, but none have.intoto.jsonlSLSA provenance files. The Scorecard awards 10/10 only when.intoto.jsonlis present. Since the Scorecard checks the last 5 releases, the score will ramp up gradually with each new release.Test plan
release-binariesworkflow completes all 3 build jobs +combine-hashes+provenancemultiple.intoto.jsonlfile alongside the existing.sigstore.jsonbundlesslsa-verifier verify-artifact --provenance-path multiple.intoto.jsonl --source-uri github.com/archgate/cli <artifact>