nixos-config/system/desktop/user.nix

{ config, lib, pkgs, ... }: {
  programs.custom.zsh.mainUser = config.users.users.mainUser.name;

  system.custom.mainUser = {
    enable = true;
    userName = "palo";
    authorizedKeyFiles =
      config.users.users.root.openssh.authorizedKeys.keyFiles;
  };

}