Automatic update of Docker images

I have written a little step-guide to install a WatchTower image which will monitor the running Docker images (NextCloud / Collabora / OnlyOffice,, etc) and download the latest version if any is available.

I hope it is useful for others to make certain bits more automated.

UPDATE2: Have been able to restore my server and have re-created the how-to.
UPDATE3: Changed to cloud-based Confluence website