DetSys CEO here. We've been working on this for months, and I am so excited for this to be out. This is the third time I've been part of a Linux remote builder on macOS, and we got it right this time. It is magical. The VM just comes and goes on demand. There's no SSH keys, IPs, remote store copying, it is almost completely transparent. Let me know if you have questions :)

It's a bit streamlined over the LnL7 Nix Docker solution I would be recommending yesterday.

On a Linux machine, if the development works, the container build will usually work. For MacOS users, they have to wonder a lot more, and you want them to be answer the question on their own, so it's important to have a Linux builder available for them.