Easily change the port

[Moosbueffel]

As a ToDo you write about changing the port. The easiest way will be to provide a docker file. In this case the user can easily configure the port in the .yml - file.

Mostly docker will be used on (Linux-) servers, but for windows its also available.

[yelhouti]

I would rather have have a flag to change port, docker can onlready be used this was, you can create a PR with a docker file and add it to the release file