If you enabled `automerge` in the Renovate config, you can speed up the automerge process by using GitLab's own automerge function.
Caution (fixed in GitLab >= 12.7): when this option is enabled it is possible due to a bug in GitLab that MRs with failing pipelines might still get merged.
This is caused by a race condition in GitLab's Merge Request API - [read the corresponding issue](https://gitlab.com/gitlab-org/gitlab/issues/26293) for details.