First: Clone the repo
$ cd <repo clone root>
$ nix build ~/.config/darwin\#darwinConfigurations.cipher-4590
$ ./result/sw/bin/darwin-rebuild switch --flake .After completing the above,
darwin-rebuild will be in $PATH,
so a simple darwin-rebuild switch --flake <path> will work fine.o
$ nixos-rebuild switch --flake <repo clone root>will work
(if your hostname happens to be bennett-{server,laptop}).