Support for xdebug in local development with docker

[ArgusKay99]

Feature Request

Q	A
New Feature	yes
RFC	yes
BC Break	yes

Summary

Can we add xdebug to the docker-container? I created a multi-stage Dockerfile that can be built with and without xdebug.

For context: I am developing on linux with Phpstorm and use the the Docker-container that is created in the CONTRIBUTING.md file as remote PHP interpreter and when there is a xdebug installed, i can already debug unit-tests.

I'm open to suggestions to use xdebug in another way.

BC Break for local development:
docker image build will now need a target: docker image build --target php_build -t phparkitect .

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 98.12%. Comparing base (1d1af31) to head (1333913).

Additional details and impacted files

@@            Coverage Diff            @@
##               main     #587   +/-   ##
=========================================
  Coverage     98.12%   98.12%           
  Complexity      663      663           
=========================================
  Files            84       84           
  Lines          1923     1923           
=========================================
  Hits           1887     1887           
  Misses           36       36           

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