chore(CI): add Backend Deploy workflow

.github/workflows/backend-deploy.yml

@@ -0,0 +1,29 @@
+name: Backend Deploy
+
+on:
+  push:
+    branches: [main, deploy-testnet]
+  workflow_dispatch:
+
+jobs:
+  deploy-testnet:
+    environment: testnet
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Deploy to testnet
+        uses: appleboy/[email protected]
+        with:
+          host: ${{ secrets.SSH_HOST }}
+          username: ${{ secrets.SSH_USERNAME }}
+          key: ${{ secrets.SSH_PRIVATE_KEY }}
+          script: |
+            cd ${{ secrets.SSH_WORK_DIR }}
+            git status
+            git fetch origin main
+            git checkout origin/main
+            git status
+            echo ${{ secrets.SSH_PASSWORD }} | sudo -S docker compose ps
+            echo ${{ secrets.SSH_PASSWORD }} | sudo -S docker compose build
+            echo ${{ secrets.SSH_PASSWORD }} | sudo -S docker compose up -d
+            echo ${{ secrets.SSH_PASSWORD }} | sudo -S docker compose ps