feat: CI pipeline docker test

Author: winterx64

.github/workflows/ci.yml

@@ -25,3 +25,10 @@ jobs:
       - name: Run app import check
         run: |
           python -c "import main"
+
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v3
+
+      - name: Build Docker image
+        run: |
+          docker build -t fastapi-app .