By default you don't have access to your host filesystem from inside a Docker container. What you can do is to mount a volume by providing an extra parameter to the "docker run" command:
docker run [other parameters] -v /path/on/host:/path/inside/container dataiku/dss
This will allow you to access files in
/path/on/host on the host from
/path/inside/container in container.
R&D Engineer @ Dataiku