nixos/jenkins/slave: fix eval

Changed files
+1 -1
nixos
modules
services
continuous-integration
jenkins
+1 -1
nixos/modules/services/continuous-integration/jenkins/slave.nix
···
};
config = mkIf (cfg.enable && !masterCfg.enable) {
-
users.groups = optional (cfg.group == "jenkins") {
+
users.groups = optionalAttrs (cfg.group == "jenkins") {
jenkins.gid = config.ids.gids.jenkins;
};