ci: Add Node-RED 4.0 public container build job into existing workflow

.github/workflows/build-containers.yml

@@ -185,6 +185,42 @@ jobs:
           tags: ${{ steps.meta.outputs.tags }}
           push: true
 
+  build_nodered_container_40:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+        with:
+          repository: 'flowfuse/helm'
+          path: 'helm'
+      - name: Docker Meta Data
+        id: meta
+        uses: docker/metadata-action@v4
+        with:
+          tags: |
+            type=raw,enable=true,priority=200,prefix=,suffix=-4.0.x,value=${{ github.event.inputs.version }}
+          flavor: |
+            latest=false
+          images: |
+            flowforge/node-red
+            flowfuse/node-red
+      - name: Setup QEMU
+        uses: docker/setup-qemu-action@v3
+      - name: Setup Docker buildx
+        uses: docker/setup-buildx-action@v3
+      - name: docker login
+        uses: docker/login-action@v3
+        with:
+          username: flowforge
+          password: ${{ secrets.DOCKER_HUB_PASSWORD }}
+      - name: Build and push FlowForge Application container
+        uses: docker/[email protected]
+        with:
+          context: helm/node-red-container
+          file: helm/node-red-container/Dockerfile-4.0
+          platforms: linux/amd64, linux/arm64, linux/arm/v7 
+          tags: ${{ steps.meta.outputs.tags }}
+          push: true
+
   build_file_server_container:
     runs-on: ubuntu-latest
     steps: