Skill: Docker image publishing

Goal

Provide a reusable GitHub Actions workflow to build/push multi-arch images to GHCR on tag pushes.

Conventions

• •Publish on tags v*.
• •Use native Intel or ARM runners for CI/CD. Don't use QEMU
• •Use buildx + per-arch digest builds, then merge into a manifest.
• •Use docker/metadata-action for semver tag derivation.

Files

• •.github/workflows/docker-publish.yml
• •.github/workflows/prune-docker-images.yml