Hi all, the FAI installation ISO for the arm64 architecture is available! After the final piece was integrated into the fai-cd command (thanks to Yoann Conga for the patch) I successfully created my first ISO and tested it with qemu. It uses Debian 12.9 (bookworm), FAI 6.2.5 and kernel 6.11 from the backports repository.
You can get the new ISO from https://fai-project.org/fai-cd/ -- regards Thomas