Add CD pipeline for the backend

.github/workflows/publish-docker.yml

@@ -6,7 +6,7 @@ on:
       - master
 
 jobs:
-  build-and-push:
+  build-and-push-webui:
     runs-on: ubuntu-latest
 
     steps:
@@ -38,3 +38,36 @@ jobs:
 
       - name: Log out of Docker Hub
         run: docker logout
+
+  build-and-push-backend:
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Clean up space for action
+        run: rm -rf /opt/hostedtoolcache
+
+      - name: Log in to Docker Hub
+        uses: docker/login-action@v2
+        with:
+          username: ${{ secrets.DOCKER_USERNAME }}
+          password: ${{ secrets.DOCKER_PASSWORD }}
+
+      - name: Checkout repository
+        uses: actions/checkout@v3
+
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v3
+
+      - name: Set up QEMU
+        uses: docker/setup-qemu-action@v3
+
+      - name: Build and push Docker image
+        uses: docker/build-push-action@v5
+        with:
+          context: .
+          file: ./backend/Dockerfile
+          push: true
+          tags: ${{ secrets.DOCKER_USERNAME }}/whisper-webui-backend:latest
+
+      - name: Log out of Docker Hub
+        run: docker logout