Add flag for run command to retrieve output of exited containers

[SteinRobert]

When invalid commands or entrypoints are given (exiting immediately) there is currently no simple way to investigate what actually went wrong. It would be nice to have some kind of --exit-logs flag or similar to see the logs of the container.

Basically docker logs. However - the container is currently autoremove=True which means it is not even possible to do docker logs manually.

Maybe it would be enough add an --autoremove flag.

[Schille]

This will be solved Docker-like:
gefyra run ... doesn't automatically remove the containers anymore once they are exited or killed. Instead you can now pass the --rm option to gefyra run to get the old behavior back.
A docker logs <container> will return the logs from the container in question.