For openSUSE Tumbleweed run the following as root:
zypper addrepo https://download.opensuse.org/repositories/Application:Geo/openSUSE_Tumbleweed/Application:Geo.repo
zypper refresh
zypper install qgis-ltr
For openSUSE Factory PowerPC run the following as root:
zypper addrepo https://download.opensuse.org/repositories/Application:Geo/openSUSE_Factory_PowerPC/Application:Geo.repo
zypper refresh
zypper install qgis-ltr
For openSUSE Factory ARM run the following as root:
zypper addrepo https://download.opensuse.org/repositories/Application:Geo/openSUSE_Factory_ARM/Application:Geo.repo
zypper refresh
zypper install qgis-ltr