nixos/perlless: only disable installer tools that introduce perl (#388564)

  services.userborn.enable = lib.mkDefault true;

  # Random perl remnants

  system.disableInstallerTools = lib.mkDefault true;

  system.tools.nixos-generate-config.enable = lib.mkDefault false;

  programs.less.lessopen = lib.mkDefault null;

  programs.command-not-found.enable = lib.mkDefault false;

  boot.enableContainers = lib.mkDefault false;

  # Check that the system does not contain a Nix store path that contains the

  # string "perl".

  system.forbiddenDependenciesRegexes = [ "perl" ];

  # Re-add nixos-rebuild to the systemPackages that was removed by the

  # `system.disableInstallerTools` option.

  environment.systemPackages = [ pkgs.nixos-rebuild ];

}