yast2-ruby-bindings from SUSE:SLE-15-SP2:Update project
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Add repository and install manually
For pool run the following as root:
zypper addrepo https://download.opensuse.org/repositories/SUSE:SLE-15-SP2:Update/pool/SUSE:SLE-15-SP2:Update.repo zypper refresh zypper install yast2-ruby-bindings