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It looks like it failed to actually install the Repo file, probably. (It would be in /etc/yum.repos.d even with DNF.)

You could try downloading that file and manually move it into place:

 wget 'https://packages.gitlab.com/install/repositories/gitlab/gitlab-ce/config_file.repo?os=fedora&dist=22&name=centauri&source=script'
 sudo mv config_file.repo /etc/yum.repos.d/gitlab.repo
 sudo restorecon /etc/yum.repos.d/gitlab.repo
 sudo dnf makecache
 sudo dnf install gitlab

I don't have a chance to test whether that repo actually would be compatible with Fedora, as yet, though. You might find you need to edit the .repo file to pretend to be an RHEL-7 machine in order to get it to work.