slight addaption based on slack feedback

Adds a small note about train switching not being supported currently

Add plex/minio/nextcloud/ix-chart to stable train

Take backup of postgres on helm upgrade

Use nc instead of nslookup while waiting for postgres to come up

Make sure hostports are not used when update strategy is rolling update

Using nslookup, the wait time for nextcloud pod to come up can be up to 1-5 minutes. This is reduced with nc to 5-10 seconds.

Update version for minio/nextcloud/plex charts

Add Minio Chart