You can extends the current container and add your own vhost
FROM c2is/apache
# Add a vhost
ADD vhost.conf /etc/apache2/sites-available/
RUN /bin/ln -sf ../sites-available/vhost.conf /etc/apache2/sites-enabled/
<VirtualHost *:80>
ServerName symfony.local
DocumentRoot "/var/www/symfony/web"
<Directory /var/www/symfony/web>
Order allow,deny
Allow from all
</Directory>
RewriteEngine on
RewriteRule ^/(.*\.php(/.*)?)$ fcgi://php:9000/var/www/symfony/web/$1 [L,P]
</VirtualHost>
The rewrite rule line is used to link the current container with php-fpm container (use the right port, define in your docker-compose.yml)