ci-build.yml used the legacy actions/cache + /tmp/.buildx-cache local
cache with a manual rotate step. Switch it to buildx type=gha cache
(separate scopes for the main and example images), dropping the
actions/cache and rotate-cache steps.
docker.yml built each image twice per platform — one build-push-action
call per registry. Build once and push the same content-addressed image
to both ghcr.io and DockerHub via multiple outputs; the single build
digest is identical for both registries, so digest export is simplified
accordingly. The multi-arch manifest merge is unchanged.
Dmitry VerkhoturovandUmputun
51b6a7e890