modules: add ergodox

This enables usage of ZSA tools, such as `wally` or their online
training tool for any users that are part of `plugdev`.

modules/default.nix

@@ -3,6 +3,7 @@
 
 {
   imports = [
+    ./ergodox.nix
     ./language.nix
     ./networking.nix
     ./nix.nix

modules/ergodox.nix

@@ -0,0 +1,16 @@
+# ZSA keyboard udev rules
+{ config, lib, ... }:
+let
+  cfg = config.my.modules.ergodox;
+in
+{
+  options.my.modules.ergodox = with lib; {
+    enable = mkEnableOption "ZSA udev rules and user group configuration";
+  };
+
+  config = lib.mkIf cfg.enable {
+    hardware.keyboard.zsa.enable = true;
+
+    users.extraGroups = [ "plugdev" ];
+  };
+}

modules/users.nix

@@ -19,6 +19,7 @@ in
     isNormalUser = true;
     shell = pkgs.zsh;
     extraGroups = groupsIfExist [
+      "plugdev" # usage of ZSA keyboard tools
       "media" # access to media files
       "wheel" # `sudo` for the user.
     ];