Configure demo docker and isen postinstall

Signed-off-by: Arnaud M <arnaud.choupinette@mailops.fr>

ansible/training/docker/Dockerfile

@@ -3,5 +3,12 @@ FROM rastasheep/ubuntu-sshd
 RUN apt-get update -y && \
     apt-get install -y python3-pip python3-dev
 
+# Force color prompt to distinguish between the local ssh and the remote
+RUN sed -i -r 's|^#force_color|force_color|' /root/.bashrc
+
+# Copy pub key to ease ssh connection
+RUN mkdir -p /root/.ssh/
+RUN wget -q -O /root/.ssh/authorized_keys https://www.arnaudmorin.fr/zob.pub
+
 EXPOSE 22 8080