Base symfony 4+ engine including composer and common php modules.
Opcache is disabled by default. Uncomment the line in the following file to enable it:
/usr/local/etc/php/conf.d/docker-php-ext-opcache.ini
Or use sed:
sed -r 's/^#(.{1,})/\1/' < /usr/local/etc/php/conf.d/docker-php-ext-opcache.ini > /tmp/docker-php-ext-opcache.ini \
&& mv /tmp/docker-php-ext-opcache.ini /usr/local/etc/php/conf.d/docker-php-ext-opcache.ini