docs: def start(self, instance_names):
          """ If start is called from the root of a Galaxy source directory with
          no args, automatically add this instance.
          """
          if not instance_names:
              configs = (os.path.join('config', 'galaxy.ini'),
                      os.path.join('config', 'galaxy.ini.sample'))
              for config in configs:
                  if os.path.exists(config):
                      if not self.config_manager.is_registered(os.path.abspath(config)):
                          self.config_manager.add([config])
                      break