meta: Allow the playback of Bluray disks

lib/mkSystem.nix

@@ -15,6 +15,7 @@ Idea: Make miku.nix, mashu.nix, ... have the following structure
 {
   hostConfigFile
 , architecture ? "x86_64-linux"
+, bluray ? false
 }: let
   pkgs = inputs.nixpkgs;
   config = pkgs.lib;
@@ -43,7 +44,9 @@ in inputs.nixpkgs.lib.nixosSystem {
         emacs.overlay
         (import ../packages)
         (import ../overlays/simple.nix)
-
+      ]
+      ++ lib.optional bluray (import ../overlays/bluray.nix)
+      ++ [
         # Always keep sandbox.nix as the last overlay
         (import ../overlays/sandbox.nix)
       ];