containerd-ctr from Virtualization:containers:experimental project

需要 openSUSE Tumbleweed ，用 root 執行：

zypper addrepo https://download.opensuse.org/repositories/Virtualization:containers:experimental/openSUSE_Tumbleweed/Virtualization:containers:experimental.repo
zypper refresh
zypper install containerd-ctr

需要 openSUSE Leap 42.1 ，用 root 執行：

zypper addrepo https://download.opensuse.org/repositories/Virtualization:containers:experimental/openSUSE_Leap_42.1/Virtualization:containers:experimental.repo
zypper refresh
zypper install containerd-ctr

需要 openSUSE Factory standard ，用 root 執行：

zypper addrepo https://download.opensuse.org/repositories/Virtualization:containers:experimental/openSUSE_Factory_standard/Virtualization:containers:experimental.repo
zypper refresh
zypper install containerd-ctr

需要 openSUSE 13.2 ，用 root 執行：

zypper addrepo https://download.opensuse.org/repositories/Virtualization:containers:experimental/openSUSE_13.2/Virtualization:containers:experimental.repo
zypper refresh
zypper install containerd-ctr

需要 SLE 12 ，用 root 執行：

zypper addrepo https://download.opensuse.org/repositories/Virtualization:containers:experimental/SLE_12/Virtualization:containers:experimental.repo
zypper refresh
zypper install containerd-ctr