Remove container on exit

project_tests.sh

 #!/bin/bash
 set -e
 
-docker run elife/sciencebeam-gym /bin/bash -c 'venv/bin/pip install pytest nose && venv/bin/pytest sciencebeam_gym'
+docker run --rm elife/sciencebeam-gym /bin/bash -c 'venv/bin/pip install pytest nose && venv/bin/pytest sciencebeam_gym'