Squash merge feat/mail-server into main

system/modules/users.nix

@@ -1,15 +1,24 @@
-{ settings, pkgs, ... }:
+{
+  settings,
+  pkgs,
+  lib,
+  config,
+  ...
+}:
 
 {
   users.users.${settings.personal.username} = {
     isNormalUser = true;
     shell = pkgs.bash; # Actually fish
-    extraGroups = [
-      "wheel"
-      "input"
-      "networkmanager"
-      "docker"
-      "kvm"
-    ];
+    extraGroups = (
+      [
+        "wheel"
+        "input"
+        "networkmanager"
+        "docker"
+        "kvm"
+      ]
+      ++ (if config.programs.gamemode.enable then [ "gamemode" ] else [ ])
+    );
   };
 }