feat: use CI variables to detect project path

[darthf1]

Fixes #1948.

This fixes the following issue on Gitlab CI:

Generated Reports:
         - /builds/xxx/xxx/var/cache/infection/infection-gitlab.json
Please note that some mutants will inevitably be harmless (i.e. false positives).
fatal: detected dubious ownership in repository at '/builds/xxx/xxx'
To add an exception for this directory, call:
	git config --global --add safe.directory /builds/xxx/xxx
In ExecException.php line 9:
                    
  An error occured  
                    
run [--test-framework TEST-FRAMEWORK] [--test-framework-options TEST-FRAMEWORK-OPTIONS] [-j|--threads THREADS] [--only-covered] [-s|--show-mutations] [--no-progress] [--force-progress] [-c|--configuration CONFIGURATION] [--coverage COVERAGE] [--mutators MUTATORS] [--filter FILTER] [--formatter FORMATTER] [--git-diff-filter GIT-DIFF-FILTER] [--git-diff-lines] [--git-diff-base GIT-DIFF-BASE] [--logger-github [LOGGER-GITHUB]] [--map-source-class-to-test [MAP-SOURCE-CLASS-TO-TEST]] [--logger-gitlab [LOGGER-GITLAB]] [--logger-html LOGGER-HTML] [--noop] [--only-covering-test-cases] [--min-msi MIN-MSI] [--min-covered-msi MIN-COVERED-MSI] [--log-verbosity LOG-VERBOSITY] [--initial-tests-php-options INITIAL-TESTS-PHP-OPTIONS] [--skip-initial-tests] [--ignore-msi-with-no-mutations] [--debug] [--dry-run]

By utilizing the CI_PROJECT_DIR (Gitlab) and the GITHUB_WORKSPACE (Github) ENV variables to get the project root dir, the git command does not have to be invoked.

This does not resolve the issue with running Infection with one of these loggers both outside the CI and outside a GIT repository, but since my project is in a mono-repo and the pathmapping is different inside my Docker container, and the value of these loggers is inside a CI environment; I'm happy with this change.

I tested this change in a CI runner in my private Gitlab project. I have not tested this in CI runner in a Github project, as I don't have any. But the change seems pretty straight forward.

[darthf1]

All green @maks-rafalko :D

[darthf1]

Thanks for the review. All ready @sanmai :)

[maks-rafalko]

I wonder if we can break the fix introduced here: #1576

I think no, as GITHUB_WORKSPACE should return the root folder (exactly what we need), but just in case..

---

Let's wait for @sanmai's review yet

[darthf1]

I wonder if we can break the fix introduced here: #1576

I think no, as GITHUB_WORKSPACE should return the root folder (exactly what we need), but just in case..

---

Let's wait for @sanmai's review yet

Yeah, when I read the Github docs, they should both resolve to the same directory. But I have no practical experience.

[maks-rafalko]

Could you please also merge master into this branch? Should fix MT build check

[darthf1]

Comments addressed; all green.

[maks-rafalko]

Sill 👍

[sanmai]

Nice! 💯

[maks-rafalko]

Thank you @darthf1

[maks-rafalko]

Released https://github.com/infection/infection/releases/tag/0.28.1