fix(ci): handle pr container builds

Author: jkoelker

.github/workflows/container.yml

@@ -43,7 +43,19 @@ jobs:
           flavor: |
             latest=true
 
+      - name: Build image (PR)
+        if: github.event_name == 'pull_request'
+        uses: docker/build-push-action@v5
+        with:
+          context: .
+          file: Containerfile
+          load: true
+          platforms: linux/amd64
+          tags: ${{ steps.meta.outputs.tags }}
+          labels: ${{ steps.meta.outputs.labels }}
+
       - name: Build and push
+        if: github.event_name != 'pull_request'
         uses: docker/build-push-action@v5
         with:
           context: .