Drop ALSA dependency in containers

nixos/modules/virtualisation/container-config.nix

@@ -6,6 +6,8 @@ with lib;
 
   config = mkIf config.boot.isContainer {
 
+    sound.enable = mkDefault false;
+
     # Provide a login prompt on /var/lib/login.socket.  On the host,
     # you can connect to it by running ‘socat
     # unix:<path-to-container>/var/lib/login.socket -,echo=0,raw’.