when we build this container, do a dist-upgrade too, should always get latest updates to base ubuntu image

Dockerfile

@@ -16,6 +16,7 @@ RUN truncate -s0 /tmp/preseed.cfg && \
 ## cleanup of files from setup
 RUN rm -rf /var/lib/apt/lists/* /tmp/* /var/tmp/*
 RUN apt-get update && apt-get -y install python3-pip python3-psycopg2 libpq-dev gunicorn python3-ldap
+RUN apt-get update && apt-get -y upgrade
 COPY requirements.txt requirements.txt
 RUN pip3 install -r requirements.txt
 EXPOSE 443