steam-run: mark as free (only the dependencies are unfree)

      description = "Run commands in the same FHS environment that is used for Steam";

      mainProgram = "steam-run";

      name = "steam-run";

      # steam-run itself is just a script that lives in nixpkgs (which is licensed under MIT).

      # steam is a dependency and already unfree, so normal steam-run will not install without

      # allowing unfree packages or appropriate `allowUnfreePredicate` rules.

      license = lib.licenses.mit;

    };

  };

}