[#1328] Added DRUPAL_CONFIG_DIRECTORY variable override.

[richardgaunt]

Checklist before requesting a review

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Changed

1. Added DRUPAL_CONFIG_DIRECTORY environment override for config sync directory.

Issue Link: #1328

[richardgaunt]

https://github.com/drevops/scaffold/pull/1314/files
Need to implement in same way as this PR.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 46.64%. Comparing base (efb3308) to head (4009880).

Additional details and impacted files

@@             Coverage Diff              @@
##           develop    #1329       +/-   ##
============================================
- Coverage    57.25%   46.64%   -10.62%     
============================================
  Files           41       41               
  Lines         3051     3051               
============================================
- Hits          1747     1423      -324     
- Misses        1304     1628      +324     

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[AlexSkrypnyk]

@richardgaunt
Thank you for your ideas and contribution.

We've implemented this with additional test coverage in #1330