nixos/modules/common/utilities/tailscale.nix

{ config, pkgs, lib, ... }:
{
  options = {
    tailscale = {
      enable = lib.mkEnableOption {
        description = "Enable tailscale";
        default = false;
      };
    };
  };
  config = lib.mkIf (config.tailscale.enable) {
    environment.systemPackages = [ pkgs.tailscale ];
    services.tailscale.enable = true;
  };
}