Added a php accelerator which fixes maxpou#31

Author: leroy0211

php7-fpm/Dockerfile

@@ -17,12 +17,12 @@ RUN ln -s /usr/share/zoneinfo/Europe/Paris /etc/localtime
 RUN "date"
 
 # Type docker-php-ext-install to see available extensions
-RUN docker-php-ext-install pdo pdo_mysql
+RUN docker-php-ext-install pdo pdo_mysql opcache
 
 
 # install xdebug
 RUN pecl install xdebug
-RUN docker-php-ext-enable xdebug
+RUN docker-php-ext-enable xdebug opcache
 RUN echo "error_reporting = E_ALL" >> /usr/local/etc/php/conf.d/docker-php-ext-xdebug.ini
 RUN echo "display_startup_errors = On" >> /usr/local/etc/php/conf.d/docker-php-ext-xdebug.ini
 RUN echo "display_errors = On" >> /usr/local/etc/php/conf.d/docker-php-ext-xdebug.ini