nixos/users/steam.nix

{ ... }:
{
  config = {
    hardware.graphics.enable32Bit = 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
    };
  };
}