gld from server:mail project

For openSUSE Tumbleweed run the following as root:

zypper addrepo https://download.opensuse.org/repositories/server:mail/openSUSE_Tumbleweed/server:mail.repo
zypper refresh
zypper install gld

For 15.6 run the following as root:

zypper addrepo https://download.opensuse.org/repositories/server:mail/15.6/server:mail.repo
zypper refresh
zypper install gld

For SLE 12 SP5 run the following as root:

zypper addrepo https://download.opensuse.org/repositories/server:mail/SLE_12_SP5/server:mail.repo
zypper refresh
zypper install gld