docker: improve image layout and backend-only/frontend-only images (#2071)

* docker: improve image layout and backend-only image

* add tests

* add tests

* add frontend

* add frontend

* label

* fix

.github/workflows/pre-release-langflow.yml

@@ -82,6 +82,28 @@ jobs:
           tags: |
             langflowai/langflow:${{ needs.release.outputs.version }}
             langflowai/langflow:1.0-alpha
+      - name: Build and push (frontend)
+        uses: docker/build-push-action@v5
+        with:
+          context: .
+          push: true
+          file: ./docker/frontend/build_and_push_frontend.Dockerfile
+          tags: |
+            langflowai/langflow-frontend:${{ needs.release.outputs.version }}
+            langflowai/langflow-frontend:1.0-alpha
+      - name: Wait for Docker Hub to propagate
+        run: sleep 120
+      - name: Build and push (backend)
+        uses: docker/build-push-action@v5
+        with:
+          context: .
+          push: true
+          file: ./docker/build_and_push_backend.Dockerfile
+          build-args: |
+            LANGFLOW_IMAGE=langflowai/langflow:${{ needs.release.outputs.version }}
+          tags: |
+            langflowai/langflow-backend:${{ needs.release.outputs.version }}
+            langflowai/langflow-backend:1.0-alpha
 
   create_release:
     name: Create Release