moving php.ini variables for phpmyadmin to env-example

phpmyadmin/Dockerfile

@@ -5,10 +5,5 @@ LABEL maintainer="Bo-Yi Wu <appleboy.tw@gmail.com>"
 # Add volume for sessions to allow session persistence
 VOLUME /sessions
 
-RUN echo '' >> /usr/local/etc/php/conf.d/php-phpmyadmin.ini \
- && echo '[PHP]' >> /usr/local/etc/php/conf.d/php-phpmyadmin.ini \
- && echo 'post_max_size = 2G' >> /usr/local/etc/php/conf.d/php-phpmyadmin.ini \
- && echo 'upload_max_filesize = 2G' >> /usr/local/etc/php/conf.d/php-phpmyadmin.ini
-
 # We expose phpMyAdmin on port 80
 EXPOSE 80