For openSUSE Tumbleweed run the following as root:
zypper addrepo https://download.opensuse.org/repositories/openSUSE:Tools:OSRT:TestGithub:openSUSE:openSUSE-release-tools:PR-2879/openSUSE_Tumbleweed/openSUSE:Tools:OSRT:TestGithub:openSUSE:openSUSE-release-tools:PR-2879.repo
zypper refresh
zypper install openSUSE-release-tools
For 15.3 run the following as root:
zypper addrepo https://download.opensuse.org/repositories/openSUSE:Tools:OSRT:TestGithub:openSUSE:openSUSE-release-tools:PR-2879/15.3/openSUSE:Tools:OSRT:TestGithub:openSUSE:openSUSE-release-tools:PR-2879.repo
zypper refresh
zypper install openSUSE-release-tools