Create snapshot with current db and gitlab backups

The helper scripts that create mysql/postgres database dumps as well as the script running gitlab-backup were executed after the btrfs snapshot was taken. This resulted in stale db and gitlab backups (from last run).

Move execution of these helper scripts further up so their outputs get included in the btrfs snapshot.

requested review from @jelle, @svenstaro, and @klausenbusk

changed the description

approved this merge request

approved this merge request

mentioned in commit 3fa8851a

merged

Deployed; will check tomorrow that it had the expected effect.