Docker image publishing

Publish multi-arch Docker images to GHCR by automating builds with Docker Buildx in GitHub Actions workflows, generating per-architecture manifests, and pushing the combined image to the GitHub Container Registry upon release.

Automating tag-based releases for Docker images in CI involves leveraging the docker/metadata-action to extract semantic version tags, triggering GitHub Actions workflows on new tags, and building the images with Docker Buildx before pushing to GHCR.

Docker Buildx is required to build amd64 and arm64 images for GitHub Container Registry, as it provides the necessary build capabilities to construct per-architecture image manifests and simplify multi-arch publishing workflows.

GitHub Actions workflows can maintain per-architecture Docker image manifests by orchestrating Docker Buildx builds for multiple architectures like amd64 and arm64, then consolidating and pushing the final multi-arch manifest to GHCR.

Semantic tagging is required when publishing multi-architecture Docker images via GitHub Actions because the docker/metadata-action uses semantic versioning to correctly label and organize per-tag releases and image manifests in GHCR.

Multi-arch Docker image builds via GitHub Actions are limited by their complexity and error-prone nature without a repeatable pattern, requiring precise configuration of Docker Buildx, docker/metadata-action, and workflow triggers to successfully publish to GHCR.