`local-tester.sh -D` fails

[fpotier]

Using the -D option on local-test.sh fails:

docker run --rm --privileged -d -v /home/fpotier/dojo:/opt/pwn.college -v /home/fpotier/dojo/data:/data:shared -v /tmp/tmp.Io2JxJNnDM:/data:shared -p 2222:22 -p 80:80 -p 443:443 --name dojo-test dojo
docker: Error response from daemon: Duplicate mount point: /data.