check if the docker images can be updated automaticly

[Paeti]

usefull links:

• https://stackoverflow.com/questions/26423515/how-to-automatically-update-your-docker-containers-if-base-images-are-updated
• https://binfalse.de/2017/01/24/automatically-update-docker-images/
• https://medium.com/@caleblemoine/automatically-update-docker-containers-f2ccc79f4313
• https://www.michelebologna.net/2018/automatically-update-your-docker-base-images-with-watchtower/