Related to bug 13554.
centos8-arm64-min environment for Grid'5000.
The qemu-sendkeys.rb script is not working for Rocky & CentOS distributions on ARM architectures.
So I made a workaround using xorriso to modify the
grub.cfg file of the installer iso, so that passing the
inst.ks=<...> argument doesn't need to be done when the iso is booting.