suse-csb-release from isv:SUSE:suse-it-infra project

需要 15.4 ，用 root 執行：

zypper addrepo https://download.opensuse.org/repositories/isv:SUSE:suse-it-infra/15.4/isv:SUSE:suse-it-infra.repo
zypper refresh
zypper install suse-csb-release