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When using cnab-go in porter, we have a requirement to be able to cancel a long running task.
To this end, I've updated the Run method such that you can provide in a context and then I've updated the docker.exec method such that if the context is cancelled, it will attempt to stop the container.
This is just a suggestion, and one possible solution towards getporter/porter#2234, happy to take feedback and suggestions :)
Cheers!