When I'm doing local testing of Linux builds, each invocation of .circleci/run_docker_build.sh leaves behind a dead Docker container when the build finishes (successfully or not). These are a bit tedious to clean up. I have also not found that it is that important to preserve the containers, since all of the useful state is in the build_artifacts directory that has its own life outside of the container. So, should we add a --rm flag to the docker run command to cause it to automatically remove the containers when they're done running?

If what I wrote above is all correct, I really don't think there's any downside, but perhaps I'm missing something.