Empty lists/.base needed for alterator-pkg to calculate the space
required for installation when selecting groups.
See-also: https://lists.altlinux.org/pipermail/devel-distro/2020-December/002239.html

This target needed for alterator-setup (pkg step).
Also added preinstall and eth-net steps.

This target disable cleanup install packages after finishing
alterator-setup.

This is an experimental and known incomplete support
for the system configuration that has to be done at the
first boot-up by its user since it's their choice.

This draft uses systemd which has been a requirement :-/
Thanks sem@ for helping out with the somewhat tricky
unit file for alterator-setup.