add steam

configuration.nix

@@ -64,6 +64,20 @@ in
     enable = true;
     xwayland.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"
+  ];
+
+
 
   services.openssh = {
     enable = true;