add virtualbox

nixos/boxes/foureighty/default.nix

@@ -13,6 +13,7 @@
     ./tailscale-foureighty.nix
     ../../distributed-builds.nix
     ../../libvirt.nix
+    ../../virtualbox.nix
     ../../backups.nix
     ../../gui
     ../../i3

nixos/virtualbox.nix

@@ -1,6 +1,9 @@
 { config, pkgs, ... }:
 {
+  nixpkgs.config.allowUnfree = true;
   virtualisation.virtualbox.host = {
     enable = true;
+    enableExtensionPack = true;
   };
+  users.extraGroups.vboxusers.members = [ "cyryl" ];
 }