Keep ping as NixOS service

    systemd.services.keep-ping-to-srht = {
      wantedBy = ["network-online.target"];
      requires = ["network-online.target"];
      after = ["network-online.target"];
      script = "${pkgs.busybox}/bin/ping qeef.srht.site";
      serviceConfig = {
        Restart = "always";
      };
    };