virt-install from home:Vertigo.Red:branches:Virtualization project

需要 15.5 ，用 root 執行：

zypper addrepo https://download.opensuse.org/repositories/home:Vertigo.Red:branches:Virtualization/15.5/home:Vertigo.Red:branches:Virtualization.repo
zypper refresh
zypper install virt-install