Revisit lifecycle policy for object storage
In gitlab-com/migration#222 (comment 72145998), we decided to set up deleting old versions of objects after 30 days and we decided to revisit this with an issue later. As it is no longer part of the migration, I've created it here.
Currently, we keep archived objects for 30 days and later delete them. We should also consider archiving very old artifacts into Google's nearline or coldline storage to save on very infrequently accessed objects.