Update release_setup.sh to be an entrypoint script
This should slightly improve the invokation of Statanalysis as an application. E.g. will be able to do something like:
docker run --rm --pull always -v someFile.root:/file.root -e DISPLAY=host.docker.internal:0 -it gitlab-registry.cern.ch/atlas/statanalysis:0-2 root -e "xRooBrowser b" /file.root
To start an xRooBrowser from inside a docker container.
Edited by Will Buttinger