systemd-experimental from home:vlefebvre:mkosi:initrd project

For openSUSE Tumbleweed run the following as root:

zypper addrepo https://download.opensuse.org/repositories/home:vlefebvre:mkosi:initrd/openSUSE_Tumbleweed/home:vlefebvre:mkosi:initrd.repo
zypper refresh
zypper install systemd-experimental