docker-buildx from home:nad1r project

For openSUSE Tumbleweed run the following as root:

zypper addrepo https://download.opensuse.org/repositories/home:nad1r/openSUSE_Tumbleweed/home:nad1r.repo
zypper refresh
zypper install docker-buildx

For openSUSE Slowroll run the following as root:

zypper addrepo https://download.opensuse.org/repositories/home:nad1r/openSUSE_Slowroll/home:nad1r.repo
zypper refresh
zypper install docker-buildx

For 15.6 run the following as root:

zypper addrepo https://download.opensuse.org/repositories/home:nad1r/15.6/home:nad1r.repo
zypper refresh
zypper install docker-buildx