For openSUSE Tumbleweed run the following as root:
zypper addrepo https://download.opensuse.org/repositories/hardware:sdr/openSUSE_Tumbleweed/hardware:sdr.repo
zypper refresh
zypper install soapy-rtlsdr
For openSUSE Factory ARM run the following as root:
zypper addrepo https://download.opensuse.org/repositories/hardware:sdr/openSUSE_Factory_ARM/hardware:sdr.repo
zypper refresh
zypper install soapy-rtlsdr
For 15.6 run the following as root:
zypper addrepo https://download.opensuse.org/repositories/hardware:sdr/15.6/hardware:sdr.repo
zypper refresh
zypper install soapy-rtlsdr
For 15.5 run the following as root:
zypper addrepo https://download.opensuse.org/repositories/hardware:sdr/15.5/hardware:sdr.repo
zypper refresh
zypper install soapy-rtlsdr