openstack-config: note the image metadata needed to boot a uefi image

Changed files
+3
nixos
modules
virtualisation
+3
nixos/modules/virtualisation/openstack-config.nix
···
{ config, pkgs, lib, ... }:
+
# image metadata:
+
# hw_firmware_type=uefi
+
let
inherit (lib) mkIf mkDefault;
cfg = config.openstack;