Fix usage messages being printed in debug mode

src/main.rs

@@ -835,8 +835,14 @@ where
   }
 }
 
-fn main() -> Result<(), String> {
-  Application::<Prod>::default().run()
+fn main() {
+  match Application::<Prod>::default().run() {
+    Ok(_) => {}
+    Err(e) => {
+      eprintln!("{}", e);
+      std::process::exit(1);
+    }
+  }
 }
 
 fn parse_server_configuration<F>(