Edit PHP’s realpath-cache-size, and realpath-cache-ttl for Drupal

Drupal.org's official documentation recommends overriding PHP's default realpath-cache-size and realpath-cache-ttl to "noticeably decrease Drupal's initial page generation times."

https://www.drupal.org/docs/7/managing-site-performance/tuning-phpini-for-drupal

I am currently adding the following lines to my Dockerfile that inherits from drupal:7 to accomplish this:

# Set recommended realpath_cache settings.
# See https://www.drupal.org/docs/7/managing-site-performance/tuning-phpini-for-drupal
RUN { \
    echo 'realpath_cache_size=4096K'; \
    echo 'realpath_cache_ttl=3600'; \
  } > /usr/local/etc/php/conf.d/realpath_cache-recommended.ini

Would it be worth including these in the official Docker Hub images? If so, I would be happy to provide a pull request.

Start by reviewing the Dockerfile for the image that inherits from drupal:7 and the PHP configuration entry point at /usr/local/etc/php/conf.d/. Compare the proposed realpath-cache-size and realpath-cache-ttl values with Drupal's linked documentation. Done means the recommended settings are included in the official image if that decision is approved.