For openSUSE Leap 15.6 run the following as root:
zypper addrepo https://download.opensuse.org/repositories/home:rhabacker:branches:windows:mingw/openSUSE_Leap_15.6/home:rhabacker:branches:windows:mingw.repo
zypper refresh
zypper install rpm-config-SUSE
For openSUSE Leap 15.5 run the following as root:
zypper addrepo https://download.opensuse.org/repositories/home:rhabacker:branches:windows:mingw/openSUSE_Leap_15.5/home:rhabacker:branches:windows:mingw.repo
zypper refresh
zypper install rpm-config-SUSE