docs: def execute(self):
          """
          Executes ``ansible-playbook`` and returns a string.
  
          :return: str
          """
          if self._ansible_command is None:
              self.bake()
  
          try:
              self._config.driver.sanity_checks()
              cmd = util.run_command(
                  self._ansible_command, debug=self._config.debug)
              return cmd.stdout.decode('utf-8')
          except sh.ErrorReturnCode as e:
              out = e.stdout.decode('utf-8')
              util.sysexit_with_message(str(out), e.exit_code)