Docker image doesn't has "/script" folder

[rmgogogo]

Per Dockerfile, it is copied to "/script" folder.
However bash into the docker container, no "/script" folder there.

Impact: new-user can't follow doc to generate RecordIo files.
Workaround: use the one mounted to /work/

Tried add "RUN mkdir /script" and it also can't work. Have no idea on why.