Add an option to remove docker container when linting is done

[dmitri-trofimov]

Is your feature request related to a problem? Please describe.
Running megalinter multpiple times on a local computer causes it to create many containers. Often we don't need to keep them and would like to remove them as soon as the linting is done.

Describe the solution you'd like
I would like a command line argument (like --removecontainer) that would allow me to let meagalinter know that it should cleanup after itself and remove the container when done linting. megalinter could do it by adding --rm to the docker run.

Describe alternatives you've considered
It is possible to automate the container clenaup in a different way - list containers, find the one that was just executed and remove it. But it does seem like too much complexity, considering Docker already has the --rm option.

Additional context
I can create a PR for that shortly.

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