attempt to do a build that is reused for test stages

.github/workflows/ci.yaml

@@ -21,8 +21,20 @@ jobs:
         id: date
         run: echo "date=$(date --utc +%Y%m%d.%H%M)" >> $GITHUB_OUTPUT
 
+  build:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v3
+      - name: build images
+        uses: docker/bake-action@v5
+        with:
+          files: docker-compose.yml,docker-compose.ci.yml
+
   tests:
     runs-on: ubuntu-latest
+    needs: [build]
     strategy:
       matrix:
         test_script: ["phpcs", "phpunit", "behat"]