feat: Add virtualbox module with kvm

nixos/configurations/Tytonidae/default.nix

@@ -33,6 +33,10 @@
         enable = true;
         unixName = "david";
       };
+      virtualbox = {
+        enable = true;
+        unixName = "david";
+      };
     };
     programs = {
       bash.enable = true;

nixos/modules/virtualisation/virtualbox.nix

@@ -0,0 +1,36 @@
+{
+  config,
+  lib,
+  ...
+}: let
+  cfg = config.youthlic.virtualisation.virtualbox;
+in {
+  options = {
+    youthlic.virtualisation.virtualbox = {
+      enable = lib.mkEnableOption "virtualbox";
+      unixName = lib.mkOption {
+        type = lib.types.str;
+      };
+    };
+  };
+  config = lib.mkIf cfg.enable {
+    users.groups."vboxusers".members = [cfg.unixName];
+    virtualisation.virtualbox = {
+      host = {
+        enableKvm = true;
+        enableExtensionPack = true;
+        enable = true;
+        addNetworkInterface = false;
+        enableHardening = true;
+      };
+      guest = {
+        vboxsf = true;
+        use3rdPartyModules = true;
+        seamless = true;
+        enable = true;
+        dragAndDrop = true;
+        clipboard = true;
+      };
+    };
+  };
+}