Previously the Apache was using /var/www/html as docroot, because the
VirtualHost was matching port 80 only.
/usr/sbin/locale-gen
RUN sed -i 's/^Listen 80$/Listen 8000/' /etc/apache2/ports.conf
+RUN sed -i /etc/apache2/sites-enabled/000-default.conf -e 's/:80>/:8000>/'
EXPOSE 8000
-USER 33:33
\ No newline at end of file
+USER 33:33
RUN sed -i 's/^Listen 80$/Listen 8000/' /etc/apache2/ports.conf
+RUN sed -i /etc/apache2/sites-enabled/000-default.conf -e 's/:80>/:8000>/'
EXPOSE 8000