ci: attest release artifact provenance

[MuncleUscles]

Summary

• sign SLSA provenance for all four GenVM release tarballs
• bind attestations to the exact release workflow commit through GitHub OIDC
• keep the existing tag and release flow unchanged

Safety

This PR does not create a tag or publish a release. The new step runs only when the existing manually dispatched release workflow reaches release-publish.

Validation

• actionlint .github/workflows/release.yaml
• git diff --check

Consumer

The matching genlayer-e2e artifact-validation work verifies these attestations against genlayerlabs/genvm-manager/.github/workflows/release.yaml and the frozen GenVM source SHA before caching release bytes.

[github-actions]

GenVM PR actions

Tick a box to run it (the box unticks itself when handled). Actions only run while the PR has the ci-safe label.

• Force run full tests
• Rerun full tests
• Provision executor PRs
• Merge into dev

_{Full GenVM CI runs only when rtm or run-full-tests is set — "Force run full tests" is a sticky toggle for run-full-tests. Adding rtm marks the PR ready-to-merge and also runs full tests. Merge requires: rtm, green full tests, green E2E, and the branch 0 commits behind.}

[coderabbitai]

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch feat/release-artifact-attestations

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