add check step

backend/src/main.rs

@@ -45,7 +45,7 @@ async fn main() {
 }
 
 #[allow(clippy::unused_async)]
-#[allow(clippy::unused)]
+#[allow(unused)]
 async fn await_shutdown(rx: mpsc::Receiver<bool>) -> Result<bool, mpsc::RecvError> {
     rx.recv()
 }