code: func dispatchUser(d dispatchRequest, c *instructions.UserCommand) error {
  	d.state.runConfig.User = c.User
  	return d.builder.commit(d.state, fmt.Sprintf("USER %v", c.User))
  }
docs: // USER foo
  //
  // Set the user to 'foo' for future commands and when running the
  // ENTRYPOINT/CMD at container run time.
  //