simplify user and group definitions

modules/bitcoind.nix

@@ -295,14 +295,11 @@ in {
     };
 
     users.users.${cfg.user} = {
-      name = cfg.user;
       group = cfg.group;
       extraGroups = [ "keys" ];
       description = "Bitcoin daemon user";
       home = cfg.dataDir;
     };
-    users.groups.${cfg.group} = {
-      name = cfg.group;
-    };
+    users.groups.${cfg.group} = {};
   };
 }

modules/clightning.nix

@@ -67,9 +67,7 @@ in {
         extraGroups = [ "bitcoinrpc" "keys" ];
         home = cfg.dataDir;
     };
-    users.groups.clightning = {
-      name = "clightning";
-    };
+    users.groups.clightning = {};
 
     systemd.services.clightning = {
       description = "Run clightningd";

modules/electrs.nix

@@ -58,15 +58,12 @@ in {
 
   config = mkIf cfg.enable {
     users.users.${cfg.user} = {
-        name = cfg.user;
         description = "electrs User";
         group = cfg.group;
         extraGroups = [ "bitcoinrpc" "keys" "bitcoin"];
         home = cfg.dataDir;
     };
-    users.groups.electrs = {
-      name = cfg.group;
-    };   
+    users.groups.${cfg.group} = {};
 
     systemd.services.electrs = {
       description = "Run electrs";

modules/liquid.nix

@@ -214,14 +214,11 @@ in {
         );
     };
     users.users.${cfg.user} = {
-      name = cfg.user;
       group = cfg.group;
       extraGroups = [ "keys" ];
       description = "Liquid sidechain user";
       home = cfg.dataDir;
     };
-    users.groups.${cfg.group} = {
-      name = cfg.group;
-    };
+    users.groups.${cfg.group} = {};
   };
 }

modules/lnd.nix

@@ -98,9 +98,7 @@ in {
         extraGroups = [ "bitcoinrpc" "keys" ];
         home = cfg.dataDir;
     };
-    users.groups.lnd = {
-      name = "lnd";
-    };
+    users.groups.lnd = {};
 
     systemd.services.lnd = {
       description = "Run LND";

modules/nanopos.nix

@@ -52,15 +52,12 @@ in {
   };
 
   config = mkIf cfg.enable {
-    users.users.nanopos =
-      {
+    users.users.nanopos = {
         description = "nanopos User";
         group = "nanopos";
         extraGroups = [ "keys" ];
     };
-    users.groups.nanopos = {
-      name = "nanopos";
-    };
+    users.groups.nanopos = {};
 
     systemd.services.nanopos = {
       description = "Run nanopos";