nix/modules/nixos.nix

{ pkgs, config, ... }: {                                      
  # Enable flakes:  https://nixos.wiki/wiki/Flakes
  nix.settings.experimental-features = [ "nix-command" "flakes" ];

  # Keep the system up-to-date automatically
  system = {
    autoUpgrade = {
      enable = true;
      allowReboot = false;
      # channel = https://channels.nixos.org/nixos-23.05;
      # https://search.nixos.org/options?channel=unstable&show=system.autoUpgrade.flake&from=0&size=50&sort=relevance&type=packages&query=Autoupgrade
      flake = "path:/etc/nixos/flake.nix"; # Should be /etc/nixos/flake.nix
    };
  };

  # Garbage collection -- Keep the system clean
  nix.gc = {
    automatic = true;
    dates = "daily";
    options = "--delete-older-than 7d";
  };
}