Create the monthly docs release MR automatically
This is about automating the monthly release MR as described in https://gitlab.com/gitlab-org/gitlab-docs/-/blob/main/doc/releases.md#create-release-merge-request.
This is about automating the monthly release MR as described in https://gitlab.com/gitlab-org/gitlab-docs/-/blob/main/doc/releases.md#create-release-merge-request.