sddm from home:gmbr3:Develop project

需要 openSUSE Tumbleweed ，用 root 執行：

zypper addrepo https://download.opensuse.org/repositories/home:gmbr3:Develop/openSUSE_Tumbleweed/home:gmbr3:Develop.repo
zypper refresh
zypper install sddm