GitHub release immutability locks a release's assets at publish time. The
current flow publishes the release in github-release and only afterwards uploads
the Sigstore provenance bundle (P21.1e) via 'gh release upload', which
immutability would reject (actions/attest-build-provenance#734).
Reorder to draft -> attach everything -> publish:
- github-release now creates the release as a draft (draft: true) with all build
artefacts.
- attestations attaches the provenance bundle to the draft (gh release upload
works on drafts), unchanged otherwise.
- a new publish-release job flips the draft to published + latest, gated on
'always() && needs.github-release.result == success' so a Sigstore hiccup in
attestations costs only the provenance asset, never the release — the same
isolation as before. A skipped github-release (failed publish) skips this too.
Correct with immutability off (today: release ends published with every asset)
and on (later, user toggle: all assets present before the lock). No behaviour
removed; nothing deleted.
kingchenc
1ab9bc70d1