docs: def exec_container_commands(self, action, c_name, **kwargs):
          """
          Runs all configured commands of a container configuration inside the container instance.
  
          :param action: Action configuration.
          :type action: dockermap.map.runner.ActionConfig
          :param c_name: Container name.
          :type c_name: unicode | str
          :return: List of exec command return values (e.g. containing the command id), if applicable, or ``None``
            if either no commands have been run or no values have been returned from the API.
          :rtype: list[dict] | NoneType
          """
          config_cmds = action.config.exec_commands
          if not config_cmds:
              return None
          return self.exec_commands(action, c_name, run_cmds=config_cmds)