Nix based setup for my MacBooks and NixOS machines
MacOS:
sudo nix run github:nix-darwin/nix-darwin -- switch --flake .#wrkExtracting resident keys, just run this and put the key in ~/.ssh and the git.nix config
in this repos will do the rest.
ssh-keygen -KIf messing up with substituters clean up likes so:
```bash
sudo nixos-rebuild switch \
--flake /home/scav/.dotfiles#thinkpad \
--option substituters 'https://cache.nixos.org/ https://cache.nixos-cuda.org https://scavpkgs.cachix.org'