faucet(steam): add steam program and directories

faucet/steam/default.nix

@@ -0,0 +1,23 @@
+{ pkgs
+, lib
+, config
+, ... }: with lib; let
+  cfg = config.faucet.steam;
+in {
+  options.faucet.steam = {
+    enable = mkEnableOption "steam software and environment";
+  };
+
+  config = mkIf cfg.enable {
+    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
+    };
+
+    users.home.persist.directories = [
+      ".local/share/Steam"
+      ".steam"
+    ];
+  };
+}