APT package repository GPG key?

Hi,

according to the docs (https://gluu.org/docs/gluu-server/4.3/installation-guide/install-ubuntu/), the GPG key for apt should be downloaded here: https://repo.gluu.org/ubuntu/gluu-apt.key. However, this URL requires authentication. Has the package repository moved? Or are the packages not available anymore?

Best regards
Matthias