nut: configure the user and group nut should be built with

The udev rules which are generated during build are defaulting to the
`nobody` user which does not exist and should not be used (ref: [#55370](https://github.com/NixOS/nixpkgs/issues/55370))

This was also raised upstream [networkupstools/nut#3173](https://github.com/networkupstools/nut/issues/3173) and was informed that the `nobody` user will stay as is but they will consider adding a warning.
The user and group should be set by the builder (end user / distribution).

pkgs/by-name/nu/nut/package.nix

@@ -106,6 +106,8 @@ stdenv.mkDerivation rec {
     "--with-systemdshutdowndir=$(out)/lib/systemd/system-shutdown"
     "--with-systemdtmpfilesdir=$(out)/lib/tmpfiles.d"
     "--with-udev-dir=$(out)/etc/udev"
+    "--with-user=nutmon"
+    "--with-group=nutmon"
   ]
   ++ (lib.lists.optionals withApcModbus [
     "--with-modbus+usb"