Update to wordpress 5.0.3, added opcache

Dockerfile

 # NAME leenooks/wordpress
-# VERSION 4.9.2-fpm
+# VERSION 5.0.3-fpm
 
-FROM wordpress:4.9.2-fpm
+FROM wordpress:5.0.3-fpm
 
 RUN apt-get update && apt-get install -y openssh-server ssmtp && rm -rf /var/lib/apt/lists/* /tmp/* \
 	&& useradd -c "Hosting Admin User" -u 1000 -g users -G www-data -d /var/www/html -M lamp \
@@ -15,3 +15,5 @@ EXPOSE 9000/tcp 22/tcp
 COPY start /usr/local/sbin
 ENTRYPOINT [ "/usr/local/sbin/start" ]
 CMD [ "php-fpm" ]
+
+RUN docker-php-ext-install -j$(nproc) opcache