For openSUSE Tumbleweed run the following as root:
zypper addrepo https://download.opensuse.org/repositories/devel:Factory:git-workflow:staging:glaubitz:oci-cli:7/openSUSE_Tumbleweed/devel:Factory:git-workflow:staging:glaubitz:oci-cli:7.repo
zypper refresh
zypper install oci-cli
For Factory run the following as root:
zypper addrepo https://download.opensuse.org/repositories/devel:Factory:git-workflow:staging:glaubitz:oci-cli:7/Factory/devel:Factory:git-workflow:staging:glaubitz:oci-cli:7.repo
zypper refresh
zypper install oci-cli