git-gui from home:paddg project

For 15.7 run the following as root:

zypper addrepo https://download.opensuse.org/repositories/home:paddg/15.7/home:paddg.repo
zypper refresh
zypper install git-gui

For 15.5 run the following as root:

zypper addrepo https://download.opensuse.org/repositories/home:paddg/15.5/home:paddg.repo
zypper refresh
zypper install git-gui