Docker build loads image into daemon unnecessarily

docker/build-push-action with load: true loads the built image into the local Docker daemon. This adds serialization overhead and is only needed when a subsequent step in the same job uses the image locally (e.g., docker run, docker compose, docker tag, docker save).

# triggers the rule: load: true but image unused
- uses: docker/build-push-action@v6
  with:
    context: .
    push: true
    load: true
    tags: myrepo/myimage:latest

If no later step in the job needs the image in the daemon, remove load: true to avoid the unnecessary load overhead.

The check is skipped when tags contains a ${{ }} expression, since the image name cannot be statically resolved.