libgdm1 from isv:SUSE:suse-it-infra project

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For 15.4 run the following as root:
zypper addrepo https://download.opensuse.org/repositories/isv:SUSE:suse-it-infra/15.4/isv:SUSE:suse-it-infra.repo
zypper refresh
zypper install libgdm1