rubygem-rack from Virtualization:containers:Portus:Release:1.0.0 project

需要 SLE 12 ，用 root 執行：

zypper addrepo https://download.opensuse.org/repositories/Virtualization:containers:Portus:Release:1.0.0/SLE_12/Virtualization:containers:Portus:Release:1.0.0.repo
zypper refresh
zypper install rubygem-rack