automatic build/load of base container

Author: HardMax71

.github/workflows/docker.yml

@@ -34,8 +34,8 @@ jobs:
       - name: Set up Docker Buildx
         uses: docker/setup-buildx-action@v3
 
+      # Always login - needed even for PRs to push base image for dependent builds
       - name: Log in to GitHub Container Registry
-        if: github.event_name != 'pull_request'
         uses: docker/login-action@v3
         with:
           registry: ${{ env.REGISTRY }}
@@ -63,13 +63,12 @@ jobs:
         with:
           context: ./backend
           file: ./backend/Dockerfile.base
-          push: ${{ github.event_name != 'pull_request' }}
+          # Always push base - backend/frontend depend on it via build-contexts
+          push: true
           tags: ${{ steps.meta-base.outputs.tags }}
           labels: ${{ steps.meta-base.outputs.labels }}
           cache-from: type=gha
           cache-to: type=gha,mode=max
-          # Also build locally for dependent images
-          load: true
 
       # =========================================================================
       # BACKEND IMAGE