steam: initial commit and depoyment

hosts/dionach.nix

@@ -7,6 +7,7 @@
   imports = [
     ../hardware/purism_librem_15.nix # Include results of the hardware scan.
     ../profiles/desktop_common.nix
+    ../profiles/steam.nix
   ];
 
   deployment.targetHost = "10.42.0.190";

profiles/steam.nix

@@ -0,0 +1,19 @@
+# Steam configuration for NixOS
+{
+  config,
+  lib,
+  pkgs,
+  ...
+}: {
+  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
+  };
+  nixpkgs.config.allowUnfreePredicate = pkg:
+    builtins.elem (lib.getName pkg) [
+      "steam"
+      "steam-original"
+      "steam-run"
+    ];
+}