Get linux username of NixOS nextcloud service

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2

Try this

{
  systemd = {
    services.nextcloud-brother-filewatch = {
      serviceConfig = {
        User = config.users.users.nextcloud.name;
        ExecStart = "${lib.getExe config.services.nextcloud.occ} groupfolders:scan ${nextcloud-groupfolder-id}";
      };
    };
  };
}