Update Dockerfile

Dockerfile

@@ -47,6 +47,7 @@ RUN git clone https://github.com/pyenv/pyenv.git /builder/.pyenv && \
     PYTHON_CONFIGURE_OPTS="--enable-shared" pyenv install --force 3.6.4
 
 # Entry point
+USER root
 COPY bootstrap.sh /root/bootstrap.sh
 RUN chmod u+x /root/bootstrap.sh
 ENTRYPOINT ["/root/bootstrap.sh"]