Allow APACHE_DOCUMENT_ROOT to be set outside of /var/www/html

[ghost]

Expected Behavior

I think that APACHE_DOCUMENT_ROOT should be allowed to be set outside of /var/www/html. Since regular Apache configuration allows it.

Current Behavior

Currently you can only set a subfolder of /var/www/html:
https://github.com/thecodingmachine/docker-images-php/blob/v2/Dockerfile.7.2.slim.apache#L77-L80

Possible Solution

The solution would be to set the default to /var/www/html and if the variable is set override the entirety of the default instead. Problem is that I don't see a way that keeps backward compatibility without introducing a secondary variable.

Context

The reason for me requesting this is because on my development environment I'm using Docker in Docker setup to control my environment from inside. When using docker-compose you'd want to have the path be the exact same as on your host system. This allows you to docker-compose ps your docker system.

[moufmouf]

This was a BC break change so I waited for v3 images to release this. This is implemented in the new v3 image.
See 3f0c4f4#diff-bf5448a20dea5f94057341c991830bed

[ghost]

Thank you @moufmouf