refactor: enable modules to add groups to users themselves

system/users/phundrak.nix

@@ -10,13 +10,20 @@ in {
   options.mySystem.users.phundrak = {
     enable = mkEnableOption "Enables user phundrak";
     trusted = mkEnableOption "Mark the user as trusted by Nix";
+    extraGroups = mkOption {
+      type = types.listOf types.str;
+      default = [];
+      example = ["feedbackd"];
+    };
   };
 
   config = {
     users.users.phundrak = mkIf cfg.enable {
       isNormalUser = true;
       description = "Lucien Cartier-Tilet";
-      extraGroups = ["networkmanager" "wheel" "docker" "dialout" "podman" "plugdev" "games" "audio" "input" "uinput"];
+      extraGroups =
+        ["networkmanager" "wheel" "dialout" "plugdev" "games" "audio" "input"]
+        ++ cfg.extraGroups;
       shell = pkgs.zsh;
       openssh.authorizedKeys.keyFiles = lib.filesystem.listFilesRecursive ../../users/phundrak/keys;
     };