fix(ci): update build job to use Dockerfile.prod

- Specify Dockerfile.prod as build target

Author: iodsky

.github/workflows/ci.yml

@@ -88,7 +88,7 @@ jobs:
       - name: Build and push Image
         uses: docker/build-push-action@v4
         with:
-          context: ./src
+          file: ./Dockerfile.prod
           push: true
           tags: ghcr.io/${{ github.repository_owner }}-api:latest
           cache-from: type=gha