upgrade & opt

- flutter 3.0.1
- show snackbar when no server to ping
- server detail page replace nice to iowait
- make script show stdout when error

make.dart

@@ -135,7 +135,8 @@ Future<void> flutterBuild(
 
     print('Done.\n');
   } else {
-    print(buildResult.stderr.toString());
+    print(buildResult.stdout);
+    print(buildResult.stderr);
     print('\nBuild failed with exit code $exitCode');
     exit(exitCode);
   }