nixos/logcheck: define group, fix after #133166

nixos/modules/misc/ids.nix

@@ -139,7 +139,7 @@ in
       #users = 100; # unused
       # cgminer = 101; #dynamically allocated as of 2021-09-17
       munin = 102;
-      logcheck = 103;
+      #logcheck = 103; #dynamically allocated as of 2021-09-17
       #nix-ssh = 104; #dynamically allocated as of 2021-09-03
       dictd = 105;
       couchdb = 106;

nixos/modules/services/logging/logcheck.nix

@@ -215,12 +215,16 @@ in
 
     users.users = optionalAttrs (cfg.user == "logcheck") {
       logcheck = {
-        uid = config.ids.uids.logcheck;
+        group = "logcheck";
+        isSystemUser = true;
         shell = "/bin/sh";
         description = "Logcheck user account";
         extraGroups = cfg.extraGroups;
       };
     };
+    users.groups = optionalAttrs (cfg.user == "logcheck") {
+      logcheck = {};
+    };
 
     system.activationScripts.logcheck = ''
       mkdir -m 700 -p /var/{lib,lock}/logcheck