ci: pull images via gitlab dependency proxy
Pull images via gitlab Dependency Proxy (https://docs.gitlab.com/ee/user/packages/dependency_proxy/) instead of morgana-harbor.psi.ch
Code indexing in gitaly is broken and leads to code not being visible to the user. We work on the issue with highest priority.
Pull images via gitlab Dependency Proxy (https://docs.gitlab.com/ee/user/packages/dependency_proxy/) instead of morgana-harbor.psi.ch