separate job to build static-webserver

.github/workflows/ci-testing-deploy.yml

@@ -300,7 +300,54 @@ jobs:
         run: |
           export DOCKER_IMAGE_TAG=$(exec ci/helpers/build_docker_image_tag.bash)
           mkdir --parents /${{ runner.temp }}/build
-          make build local-dest=/${{ runner.temp }}/build
+          make build local-dest=/${{ runner.temp }}/build exclude=static-webserver
+      - name: upload build artifacts
+        uses: actions/upload-artifact@v4
+        with:
+          name: docker-buildx-images-${{ runner.os }}-${{ github.sha }}
+          path: /${{ runner.temp }}/build
+
+  build-test-images-frontend:
+    # this step comes first, so that it is executed as first job in push calls
+    # in PR calls this step is anyway skipped
+    needs: changes
+    if: ${{ needs.changes.outputs.anything-js == 'true' || github.event_name == 'push' }}
+    timeout-minutes: 30
+    runs-on: ${{ matrix.os }}
+    strategy:
+      matrix:
+        python: ["3.11"]
+        os: [ubuntu-22.04]
+      fail-fast: false
+    name: "[build] docker images"
+    steps:
+      - name: Remove unused software
+        run: |
+          echo "Available storage before:"
+          sudo df -h
+          echo
+          sudo rm -rf /usr/share/dotnet
+          sudo rm -rf /usr/local/lib/android
+          sudo rm -rf /opt/ghc
+          sudo rm -rf /opt/hostedtoolcache/CodeQL
+          echo "Available storage after:"
+          sudo df -h
+          echo
+      - uses: actions/checkout@v4
+      - name: setup docker buildx
+        id: buildx
+        uses: docker/setup-buildx-action@v3
+        with:
+          driver: docker-container
+      - name: expose github runtime for buildx
+        uses: crazy-max/ghaction-github-runtime@v3
+      - name: show system environs
+        run: ./ci/helpers/show_system_versions.bash
+      - name: build images
+        run: |
+          export DOCKER_IMAGE_TAG=$(exec ci/helpers/build_docker_image_tag.bash)
+          mkdir --parents /${{ runner.temp }}/build
+          make build local-dest=/${{ runner.temp }}/build target=static-webserver
       - name: upload build artifacts
         uses: actions/upload-artifact@v4
         with: