For openSUSE Tumbleweed run the following as root:
zypper addrepo https://download.opensuse.org/repositories/home:adrianSuSE:himbeere/openSUSE_Tumbleweed/home:adrianSuSE:himbeere.repo
zypper refresh
zypper install joomla
For 15.6 run the following as root:
zypper addrepo https://download.opensuse.org/repositories/home:adrianSuSE:himbeere/15.6/home:adrianSuSE:himbeere.repo
zypper refresh
zypper install joomla
For 15.5 run the following as root:
zypper addrepo https://download.opensuse.org/repositories/home:adrianSuSE:himbeere/15.5/home:adrianSuSE:himbeere.repo
zypper refresh
zypper install joomla