Add Factorio client to oscar

oscar/configuration.nix

@@ -2,7 +2,7 @@
 # your system.  Help is available in the configuration.nix(5) man page
 # and in the NixOS manual (accessible by running ‘nixos-help’).
 
-{ config, pkgs, ... }:
+{ config, pkgs, lib, ... }:
 
 {
   imports =
@@ -12,6 +12,10 @@
       <home-manager/nixos>
     ];
 
+  nixpkgs.config.allowUnfreePredicate = pkg: builtins.elem (lib.getName pkg) [
+    "factorio-alpha"
+  ];
+
   # https://discourse.nixos.org/t/github-strategies-for-configuration-nix/1983/14
   nix.nixPath = [
     "nixpkgs=/nix/var/nix/profiles/per-user/root/channels/nixos"
@@ -160,6 +164,7 @@
   environment.systemPackages = with pkgs; [
   #  vim # Do not forget to add an editor to edit configuration.nix! The Nano editor is also installed by default.
   #  wget
+  factorio
   ];
 
   # Some programs need SUID wrappers, can be configured further or are