[CoD2] Setup CoD2 with Docker

[Lonsofore]

Heads up: Docker is making changes to their image retention policy on Docker Hub. Inactive images, defined as images that have not been pulled or pushed in 6 months, will be deleted from Docker Hub starting November 1, 2020.
So please make sure to (automatically) rebuild your image at least every 6 months or nobody will be able to pull the image anymore..... which would be a shame, because it's a great image

Thank you for the information! I think, it's easier to make a cron-task to pull the image every month. Actually, even without the image on Docker Hub it's always possible to build it on your own machine with the Github repo.