Firejail to sandbox online games

system/app/prismlauncher.nix

@@ -0,0 +1,5 @@
+{ config, lib, pkgs, ... }:
+
+{
+  environment.systemPackages = [ pkgs.prismlauncher ];
+}

system/app/steam.nix

@@ -3,4 +3,5 @@
 {
   hardware.opengl.driSupport32Bit = true;
   programs.steam.enable = true;
+  environment.systemPackages = [ pkgs.steam ];
 }