Configuration for my various machines!
{ lib, ... }: {
  services.tailscale = {
    enable = true;
    useRoutingFeatures = lib.mkDefault "client";
    extraUpFlags = ["--login-server https://tailscale.aptenodytes.ca"];
  };

  networking.firewall.allowedUDPPorts = [ 41641 ];
  
  #environment.persistence = {
  #  "/persist".directories = ["/var/lib/tailscale"];
  #};
}