A few days ago, I've added a new feature to the FAI.me build service.
Additionally to creating an installation image, FAI.me can now build bootable disk images. These disk images can be booted in a VM like KVM, Virtualbox or VMware or openstack.
You can define a disk image size, select a language, set a user and root password, select a Debian distribution and enable backports just by one click. It's possible to add your public key for access to the root account without a password. This can also be done by just specifying your GitHub account. Several disk formats are supports, like raw (compressed with xz or zstd), qcow2, vdi, vhdx and vmdk. And you can add your own list of packages, you want to have inside this OS. After a few minutes the disk image is created and you will get a download link, including a log the the creation process and a link to the FAI configuration that was used to create your customized image.
The new service is available at
https://fai-project.org/FAIme/cloud
If you have any comments, feature requests or feedback, do not hesitate to contact me.