anchor.diff:      && apt-get autoremove -y --purge \
       && apt-get clean && rm -rf /var/lib/apt/lists/* /tmp/* /var/tmp/*
   
  -# start Postgres server and set the default user password. WARNING: insecure password
  -# TODO: create a unique, secure password at build time (if possible/practical?)
  +# start Postgres server and set the default user password
   RUN /etc/init.d/postgresql start \
       && sudo -u postgres psql -c "ALTER USER postgres PASSWORD '${pg_password}';" \
       && sudo -u postgres psql -c "CREATE EXTENSION postgis;"
  
positive.code: # FROM python:3.9-slim-buster
  FROM debian:buster-slim
  
  # Postgres user password - WARNING: change this to something more secure
  ARG pg_password="password"
  ENV PGPASSWORD=${pg_password}
  
  
negative.code: # # Add VOLUMEs to allow backup of config, logs and databases
  # VOLUME  ["/etc/postgresql", "/var/log/postgresql", "/var/lib/postgresql"]
  
  # Start postgres when starting the container
  CMD ["/usr/lib/postgresql/13/bin/postgres", "-D", "/var/lib/postgresql/13/main", "-c", "config_file=/etc/postgresql/13/main/postgresql.conf"]
  