feat(handy): package Handy for Nix

system/boot/boot.nix

@@ -60,6 +60,7 @@ in {
       then "amdgpu"
       else "i915"
     );
+    extraModulePackages = lists.optional cfg.kernel.v4l2loopback.enable config.boot.kernelPackages.v4l2loopback;
     extraModulePackages =
       strings.concatLines (strings.optionalString cfg.kernel.v4l2loopback.enable "options v4l2loopback exclusive_caps=1 devices=1 video_nr=0 card_label=" "OBS Studio" "")
       cfg.kernel.extraModprobeConfig;