Fix for prestashop container building

[achref-riahi]

Hi,

if you noticed that the prestashop container building crash at "usermod -u 1000 www-data" i solved this problem by removing the last two lines
#RUN usermod -u 1000 www-data
#RUN chown 1000 /var/www -R

and i added RUN chmod 755 /var/www/html to solve folder rights issue :)

[devnix]

What does the log output? The best thing would be to get the uid automatically from the host via docker-compose.yml, and add to the dockerfile as a build parameter.