launchd / Darwin support

[ink-splatters]

Hi,

thanks for the awesome work!

This nix-darwin module is probably the most straightforward way to support the subj (known to me).

The question for me is: if there's any chance seeing launchd / Darwin support having booked a spot at your roadmap.

In other words, if it makes sense to lazily wait for your implementation rather than hacking the way to it :)

Cheers,
Peter