add steam

hosts/perseus/configuration.nix

@@ -1,5 +1,6 @@
 {
   pkgs,
+  config,
   lib,
   name,
   ...
@@ -52,6 +53,22 @@
 
   services.udisks2.enable = true;
 
+  programs.steam = {
+    enable = true;
+    remotePlay.openFirewall = true; # Open ports in the firewall for Steam Remote Play
+    dedicatedServer.openFirewall = true; # Open ports in the firewall for Source Dedicated Server
+    localNetworkGameTransfers.openFirewall = true; # Open ports in the firewall for Steam Local Network Game Transfers
+  };
+
+  nixpkgs.config.allowUnfreePredicate =
+    pkg:
+    builtins.elem (lib.getName pkg) [
+      "steam"
+      "steam-original"
+      "steam-unwrapped"
+      "steam-run"
+    ];
+
   users.users.vbm = {
     packages = with pkgs; [
       (import ../../scripts/dwls.nix { inherit pkgs lib; })