3.8.1

• switch to a more idiomatic representation of empty images to improve quality of life when dealing with the mutuality of --hetzner-image and --hetzner-image-id auto-generated command lines (#86, thanks @MichaelKittlitz)
  • old configurations (explicitly or indirectly specifying ubuntu-18.04 as image name and then specifying an ID) will continue to work; this may not be the case for upcoming default images
  • intermediate driver configuration may not contain an image in cases
  • these changes are non-breaking for pretty much everything interacting with the machine driver API only, so I consider this merely a patch release
• add tagged build mode flag_debug, that will dump the entire driver config and passed options when raising flag-related errors
  • not active by default, has to be built manually