title: Symfony 4 debug production environments
body: <p>how to debug Symfony 4 project on production environment? I mean in a way that only I from particular IP can do it. In Symfony 2/3 I have app_dev.php controller. How to do this with Symfony 4 and Apache?
  If I change  in .env or via VirtualHost APP_ENV to dev then all app users will see debug toolbar, exception logs etc.</p>