rubygem-webrick from openSUSE:infrastructure:discourse project
Select Your Operating System
Add repository and install manually
For openSUSE Tumbleweed run the following as root:
zypper addrepo https://download.opensuse.org/repositories/openSUSE:infrastructure:discourse/openSUSE_Tumbleweed/openSUSE:infrastructure:discourse.repo zypper refresh zypper install rubygem-webrick