add database service to backend test

.gitea/workflows/backend.yaml

@@ -41,6 +41,20 @@ jobs:
         run: cargo build --release --locked
 
   test:
+    services:
+      db:
+        image: postgres:17-alpine
+        ports:
+          - "5432:5432"
+        env:
+          POSTGRES_USER: postgres
+          POSTGRES_PASSWORD: postgres
+          POSTGRES_DATABASE: nuchat_test
+        options: >-
+          --health-cmd pg_isready
+          --health-interval 10s
+          --health-timeout 5s
+          --health-retries 5
     runs-on: rust-nextest
     defaults:
       run:
@@ -59,6 +73,8 @@ jobs:
         run: cargo build --locked --bin nuchat
       - name: Run Tests
         run: ./scripts/test.sh
+        env:
+          POSTGRES_URL: "postgresql://postgres:postgres@postgres:5432"
       - name: Upload Test Logs
         if: ${{ failure() }}
         uses: actions/upload-artifact@v3