nixos/cgminer: define group, fix eval after #133166

nixos/modules/misc/ids.nix

@@ -137,7 +137,7 @@ in
       #mongodb = 98; #dynamically allocated as of 2021-09-03
       #openldap = 99; # dynamically allocated as of PR#94610
       #users = 100; # unused
-      cgminer = 101;
+      # cgminer = 101; #dynamically allocated as of 2021-09-17
       munin = 102;
       logcheck = 103;
       #nix-ssh = 104; #dynamically allocated as of 2021-09-03

nixos/modules/services/misc/cgminer.nix

@@ -110,10 +110,14 @@ in
 
     users.users = optionalAttrs (cfg.user == "cgminer") {
       cgminer = {
-        uid = config.ids.uids.cgminer;
+        isSystemUser = true;
+        group = "cgminer";
         description = "Cgminer user";
       };
     };
+    users.groups = optionalAttrs (cfg.user == "cgminer") {
+      cgminer = {};
+    };
 
     environment.systemPackages = [ cfg.package ];