Add "generic", "genericcloud", and "nocloud" debian 10 images
This is a series based on #74 (closed). It does:
- Add the "openstack" variant to the current entries;
- Add the "generic", "genericcloud", and "nocloud" debian 10 images;
The definition of the debian images can be found https://salsa.debian.org/cloud-team/debian-cloud-images and does mention:
- generic: Should run in any environment
- genericcloud: Should run in any virtualised environment. Is smaller than generic by excluding drivers for physical hardware.
- nocloud: Mostly useful for testing the build process itself. Doesn't have cloud-init installed, but instead allows root login without a password.
I've done this only for debian 10 as debian testing only has "daily" images which is way too much to keep track of.