Customizing PHP settings in Docker instances

Hello there.

I’m not sure if this is something that has to be asked here or in GitHub, so sorry in case.

The question is related to docker instances of OwnCloud, where deeper customization is needed in terms of system tuning like upload size limits.

If I have to fine-tune php.ini, how should I do? Is there any environmental variable to use and/or another way, or should I extend the owncloud/php image?

Thanks in advance.