feat: add exegol for desktop

nixos/desktop/default.nix

@@ -1,6 +1,7 @@
 {
   imports = [
     ./hardware-configuration.nix
+    ./exegol.nix
   ];
 
   # Enable CUPS to print documents.
@@ -21,6 +22,8 @@
   #   pulse.enable = true;
   # };
 
+  kekleo.exegol = true;
+
   users.users = {
     leonhard = {
       initialPassword = "leonhard";

nixos/desktop/exegol.nix

@@ -0,0 +1,19 @@
+{
+  config,
+  lib,
+  pkgs,
+  ...
+}:
+{
+  options.kekleo.exegol = lib.mkOption {
+    type = lib.types.bool;
+    default = false;
+    description = "Whether to enable exegol.";
+  };
+
+  config = lib.mkIf config.kekleo.exegol {
+    virtualisation.docker.enable = true;
+    users.extraGroups.docker.members = [ "leonhard" ];
+    environment.systemPackages = with pkgs; [ exegol4 ];
+  };
+}