borg_client: run compact after pruning on borg 1.2
Only doing this on the Hetzner storage box for now; waiting for rsync.net to upgrade to borg 1.2 so we can enable it there too.
Due to an influx of spam, we have had to temporarily disable account registrations. Please write an email to accountsupport@archlinux.org, with your desired username, if you want to get access. Sorry for the inconvenience.
Only doing this on the Hetzner storage box for now; waiting for rsync.net to upgrade to borg 1.2 so we can enable it there too.