Perform upgrade of a docker container:

1. Make sure you use image:latest as the original image.
2. When an updated image:latest is out, just download it in the “registry” tab (wait for the actual notification that the download is complete, there is no progress bar)
3. Stop the container that needs updating
4. Select the container and press Action/Clear in the container tab.
5. Start the container up again and enjoy the new version :)