override some default values of php.ini

[orthagh]

To follow our recommendations in our documentation: https://help.glpi-project.org/tutorials/procedures/install_glpi#set-up-the-php.ini-file

[cgrard]

Salut Alexandre

In my opinion it would be even better to use environnement variables with default values to handle this (and extend it to OPcache settings for instance), here is an example of what I have in mind : https://github.com/glpi-project/docker-images/compare/feat/phpini_some_values...cgrard:docker-images:feat/phpini_some_values

This way we can let the default do its job or define an override in the docker-compose (or k8s manifest in my case)