Add Steam

modules/apps/gaming.nix

@@ -0,0 +1,24 @@
+{
+  lib,
+  config,
+  pkgs,
+  ...
+}: let
+  inherit (lib) mkEnableOption mkIf;
+  cfg = config.horseman.apps.gaming;
+in {
+  options = {
+    horseman.apps.gaming = {
+      enable = mkEnableOption "Games and things for games";
+    };
+  };
+
+  config = mkIf cfg.enable {
+    programs.steam = {
+      enable = true;
+      remotePlay.openFirewall = false; # 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
+    };
+  };
+}