Alex Stewart

@ansible42 and the NI RTOS team had a discussion offline about his use-cases. Because some parts are confidential I won't post a summary here, and I'll leave this issue open...

I think this change should go to [upstream-pyrex](https://github.com/garmin/pyrex) to see what they say. But before you do that, does the [`DOCKER_TMPDIR`](https://docs.docker.com/reference/cli/dockerd/#miscellaneous-options) config option get you what you want? I could...