talos: add steam and mangohud

hosts/talos/configuration.nix

@@ -23,6 +23,11 @@
       "nvidia-x11"
       "nvidia-settings"
       "nvidia-kernel-modules"
+      "steam"
+      "steam-original"
+      "steam-unwrapped"
+      "steam-run"
+      "osu-lazer-bin"
     ]);
   services.xserver.videoDrivers = [ "nvidia" ];
   hardware.nvidia = {
@@ -91,6 +96,13 @@
     "com.fightcade.Fightcade"
   ];
 
+  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
+  };
+
   fonts.fontconfig.enable = true;
   fonts.fontconfig.defaultFonts = {
     monospace = [
@@ -163,6 +175,7 @@
       mailcap
       gamescope
       gamemode
+      mangohud
     ];
   };