image-deploy/image-os-subtype

The cloud init data to send machine after first boot.

While image-deploy/image-os defines the overall OS type. This variable can be used to define the sub-type.

This is really only used for linux and it supports raw and other.

raw is used to support a raw image that does not need hooks.

other is used to attempt to support other linux (not debian-based or redhat-based).