For openSUSE Tumbleweed run the following as root:
zypper addrepo https://download.opensuse.org/repositories/Cloud:Tools/openSUSE_Tumbleweed/Cloud:Tools.repo
zypper refresh
zypper install oci-cli
For Factory run the following as root:
zypper addrepo https://download.opensuse.org/repositories/Cloud:Tools/Factory/Cloud:Tools.repo
zypper refresh
zypper install oci-cli
For 15.4 run the following as root:
zypper addrepo https://download.opensuse.org/repositories/Cloud:Tools/15.4/Cloud:Tools.repo
zypper refresh
zypper install oci-cli