prefer-buildx-bake-for-multiple-images

Detects CI jobs that build multiple Docker images or targets through separate Docker build invocations.

This rule looks for:

• two or more docker build or docker buildx build commands in the same job
• multiple docker/build-push-action steps in the same job
• no visible docker buildx bake invocation in that job

Why it matters:

• Repeated Docker build commands make the CI script own build scheduling and target ordering.
• docker buildx bake can model multiple images as one BuildKit target graph.
• bake files reduce duplicated tags, platforms, args, outputs, and dependency wiring across many image builds.

What to do:

• Move repeated image builds into docker-bake.hcl.
• Use a bake group for images that are released together.
• Invoke docker buildx bake from CI and compare Docker build wall-clock time and runner minutes.