ci: add Sigstore keyless release signing - #49
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- New sign-release workflow (workflow_dispatch): downloads the assets of an existing immutable release, verifies them against the published SHA256SUMS.txt, signs each with cosign keyless (GitHub OIDC identity) and produces a signature index. - release.yml: future releases sign every artifact with cosign keyless in the build and publish jobs and ship the .sigstore.json bundles as release assets from the start. - No private keys anywhere: identity is the GitHub Actions OIDC token (issuer https://token.actions.githubusercontent.com).
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What
sign-release.yml(workflow_dispatch): re-signs the assets of an existing immutable release without touching it — downloads assets, verifies them against the publishedSHA256SUMS.txt, signs each blob with cosign keyless (GitHub OIDC), and emitssignatures/<tag>/bundles plus anindex.json(artifact → SHA-256 → bundle).release.yml: build and publish jobs now sign every release artifact with cosign keyless and ship the.sigstore.jsonbundles as release assets from the start.id-token: writeadded only where signing happens (build already had it for attestations; publish gets it for the files generated there).Trust model
https://token.actions.githubusercontent.com.sign-release.yml@refs/heads/main(retroactive signing),release.yml@refs/tags/v*(future releases).v0.13.0 is immutable and is not modified by this PR; its bundles land in
signatures/v0.13.0/in a follow-up commit after the signing run.