generic: Fix firejail

hosts/generic.nix

@@ -69,6 +69,9 @@ in
     avahi.enable = false;
   };
 
+  # To allow users to use firejail
+  programs.firejail.enable = true;
+  
   security.sudo.extraConfig = ''
     Defaults env_keep += "NIXOS_CONFIG"
   '';