docs: def subcommand(self, *args):
          """Get subcommand acting on a service. Subcommand will run in service directory
             and with the environment variables used to run the service itself.
  
          Args:
              *args: Arguments to run command (e.g. "redis-cli", "-n", "1")
  
          Returns:
              Subcommand object.
          """
          return Subcommand(*args, directory=self.directory, env_vars=self.env_vars)