code: async def run_tasks(context):
      
      running_tasks = RunTasks()
      context.running_tasks = running_tasks
      status = await running_tasks.invoke(context)
      context.running_tasks = None
      return status
docs: Run any tasks returned by claimWork.
  
      Returns the integer status of the task that was run, or None if no task was
      run.
  
      args:
          context (scriptworker.context.Context): the scriptworker context.
  
      Raises:
          Exception: on unexpected exception.
  
      Returns:
          int: exit status
          None: if no task run.