While we can generally tag tasks as 'uses_docker' and use tag selection mechanisms to control which variants and distros they run on, there's a corner case with generated tasks that is difficult to handle with current mechanisms. Specifically, we don't seem to have a great way to tag generated tasks (e.g. they do not inherit tags from the generating task), so it is difficult to select them to change configuration. As a workaround, we can create a new variant that will use the correct distros by default, and only run 'uses_docker'-tagged tasks there.