Thanks to Sébastien, I updated the Dockerfile in order to resolve issue
realted to unknown container_init. In the end, I copy this file into the
init file and give the right permission to it.

I removed as welle the symbolic link to Python3 as it seems to be the
standard on this Debian image.

I removed the command "run-allgo" as it was coming from the rails
Dockerfile which is not relevant at this stage of the image.

Signed-off-by: Matthieu Berjon <matthieu.berjon@inria.fr>