To run a container from this image the globus grid cert/key directory must be mounted as a volume. To do this use the following.
sudo docker run -it -v <grid cert/key dir>:/root/.globus:ro alexanderrichards/ganga
If your using udocker to run in userspace, this becomes:
udocker run --volume=<grid cert/key dir>:/root/.globus alexanderrichards/ganga