A simple service mirroring all public repositories of one organization from Gitlab to the organization's Github account. The service is meant to run on the same host as the Gitlab instance.

go get gitlab.stusta.de/stustanet/github-mirror
cp $GOPATH/src/gitlab.stusta.de/stustanet/github-mirror/etc/github-mirror.json.example /etc/github-mirror.json

Then adjust the /etc/github-mirror.json.