Detect when a deploy includes post-deployment migrations
We should be able to validate if a package being deployed includes any post-deployment migrations.
A simple way to do so could it be running
gitlab-rails db:migrate:status after we run the regular migrations.
This information should be persisted somewhere visible to the release managers (i.e. the monthly release issue), so that in case of problems they can easily check if post-deployment migrations were part of the deployment.