On: NixOS 21.05

[squiggleblaz]

> And there's no reason to need NixOps to maintain a repo of three or four physical machines that you have around your house.

You don't. You can use `nixos-rebuild test --target-host=red --flake .#red`. If you want to build locally, add --build-host=localhost.

NixOps gives you the advantage of not having to repeat yourself, but you could easily whip up a shell script for `rebuild-switch red`.