Docker: Create the cache dir if it does not exist

Author: quartje

docker/Dockerfile.prod

@@ -12,6 +12,8 @@ COPY config/openconext/samlstepupproviders_parameters.yaml.dist config/openconex
 # Add the config files for Apache2
 RUN rm -rf /etc/apache2/sites-enabled/*
 COPY ./docker/conf/apache2.conf /etc/apache2/sites-enabled/apache2.conf
-RUN rm -rf /var/www/html/var/cache/prod && chown -R www-data /var/www/html/var
+RUN rm -rf /var/www/html/var/cache/prod && \ 
+  mkdir -p /var/www/html/var/cache/ && \ 
+  chown -R www-data /var/www/html/var
 
 EXPOSE 80