message: change log message when queue is locked
diff: @@ -19,7 +19,7 @@ pub fn queue_builder(
  // check lock file
  if build_queue.is_locked()? {
  - warn!("Lock file exists, skipping building new crates");
  + warn!("Build queue is locked, skipping building new crates");
  thread::sleep(Duration::from_secs(60));
  continue;
  }
  