Backup docker containers before installing update and allow rollback

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Sometimes an update kills a docker container. A good example is the InfluxDB container. The InfluxDB team changed the location of the database from  /var/lib/influxdb to /var/lib/influxdb2 and the unraid template maintainer missed this part, so updating this container removes the files from appdata. But there are other examples like the MariaDB 10.6 update which broke several Nextcloud installations.



Of course everyone should create backups, but most of them work only on daily basis on not exactly at the time when the user hits the update button


My feature request:

- a user hits the update button

- unraid reminds the container version

- container is removed

- appdata folder files of this container are copied on the same disk/pool through "cp --reflink=always /mnt/diskX/appdata/containername/ /mnt/diskX/appdata/containername-<containerversion>-YYYYMMDDTHHIISS/" (reflink guarantees, that it won't consume (much) additional storage space)

- recent container images are installed


Now the user gets a note that he is able to rollback for the next three days. The rollback can be started through the usual container menu. If a rollback is done, the container repository name is automatically set to containername:<containerversion>.





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