Add backend deploy script

.github/workflows/deploy.yml

@@ -1,4 +1,4 @@
-name: Deploy Frontend
+name: Deploy
 
 on:
   push:
@@ -7,7 +7,7 @@ on:
       - develop
 
 jobs:
-  build-and-deploy:
+  deploy-frontend:
     runs-on: ubuntu-latest
 
     environment: ${{ github.ref == 'refs/heads/main' && 'production' || 'staging' }}
@@ -38,3 +38,31 @@ jobs:
         AWS_SECRET_ACCESS_KEY: ${{ secrets.AWS_SECRET_ACCESS_KEY }}
         AWS_REGION: ${{ secrets.AWS_REGION }}
         SOURCE_DIR: 'dist'
+
+  deploy-backend:
+    runs-on: ubuntu-latest
+
+    steps:
+    - name: Checkout
+      uses: actions/checkout@v4
+
+    - name: Login to GitHub Container Registry
+      uses: docker/login-action@v3
+      with:
+        registry: ghcr.io
+        username: ${{ github.actor }}
+        password: ${{ secrets.GITHUB_TOKEN }}
+
+    - name: Extract metadata
+      id: meta
+      uses: docker/metadata-action@v5
+      with:
+        images: splatoon2ink/app
+
+    - name: Build and push Docker image
+      uses: docker/build-push-action@v6
+      with:
+        context: .
+        file: ./docker/app/Dockerfile
+        push: true
+        tags: splatoon2ink/app:latest