[❌ CANNOT MERGE] Added environment variable to extend opinionated open_basedir measure

[herpaderpaldent]

This PR adds the ability to extend the open_basedir setting with an environment variable

Usecase

I develop on a project that splits in multiple composer packages with a common root/core package based on laravel. In order to develop/commit on the packages i have them stored in another dir and symlink the packages into the vendor folder with composers repositories setting.

This is only done during development. Hence during development i run into open_basedir restrictions errors because other then WEBUSER_HOME no other paths are allowed.

This environment var can be used in the docker-compose.dev.yml f.e.

services:
  environment:
    PHP_BASEDIR_EXTENSION='/var/www/packages'

Testcase

✅ Throws base_dir restriction error if no PHP_BASEDIR_EXTENSION variable is set
✅ No restriction error is been thrown if variable is set (to /var/www/packages)

[jaydrogers]

So unfortunately I made a huge change to the structure of the repository, which complicated the merge.

Good news is, this feature is available on the dev branch (or the beta images): https://hub.docker.com/r/serversideup/php/tags?name=beta-&page=1&ordering=-name

Let me know if this works to expectation. You should be able to find the documentation in the README on the dev branch. 👍

I appreciate your help & efforts!