feature(steam): add steam module for all things around steam on wayland

modules/nixos/steam.nix

@@ -0,0 +1,19 @@
+{ config, lib, pkgs, ... }:
+
+{
+  # allow unfree to install steam
+  nixpkgs.config.allowUnfree = true;
+
+  # enable steam and open firewall
+  programs.steam = {
+    enable = true;
+    remotePlay.openFirewall = true;
+    dedicatedServer.openFirewall = true;
+    localNetworkGameTransfers.openFirewall = true;
+  };
+
+  # fix black screen in steam when using xwayland-satellite
+  programs.steam.package = pkgs.steam.override {
+    extraArgs = "-system-composer";
+  };
+}