A dispatch for 12.11.1-ci7 without sign_only rebuilt and re-pushed the
tag. The registry dropped the old manifest, so flux-config's
12.11.1-ci7@sha256:86d7e3b4 pin now 404s on the next pull. That is the
zegit#143 threat shape, done by accident. Like zegit-arc-runner, a build
now refuses a tag the registry already holds, and sign_only refuses one
it does not.
Co-Authored-By: Claude Opus 5.5 (1M context) <[email protected]>