`configDB` instead of `frontendb`

The configDB was not present, when the sftp-sync was first implemented, instead we used the frontendDB to get the syncing credentials.

This MR removes the need for the frontendDB, in favor of the configDB.

Also we use now a privileged minio user to do the sync. With that change we dont have to store the minio client credentials in the configDB anymore

added configdb cron externalSFTP labels

requested review from @joost.hemmen1

assigned to @bert.palm

FYI: i only changed docker-compose.yaml and cron/scripts/sftp-sync.py, all other files was just blackified

approved this merge request

approved this merge request

Looks good. I don't know why we picked the bucket credentials instead of the privileged MinIO user back then.

Regarding not having to store the minio client credentials in the configdb:

If we are planning to use the configDB also for the Thing-Management at some point, then we should keep the client credentials in the configDB. (but to be honest i am not really sure about the current plans regarding the databases...)

merged

mentioned in commit 6fd77ace