Enable GitLab CI automated testing

Looks good @liam, let me know once you are ready to run the tests.

It could be merged anytime. There are a few simple issues outstanding that should be fixed.

Looks like cspell fails, might need to add these words ['Frontdoor', 'wildcardpath', 'azurecdn']. As well some issues with README.md, maybe this can be ignored completely from cspell.

PHPStan showing this:

------ ---------------------------------------------------------------------- 
  Line   src/Form/AzureCdnPurgeForm.php                                        
 ------ ---------------------------------------------------------------------- 
  68     Method Drupal\Core\Form\ConfigFormBase::__construct() invoked with 1  
         parameter, 2 required.                                                
 ------ ---------------------------------------------------------------------- 
 ------ ---------------------------------------------------------------------- 
  Line   src/Plugin/Purge/Purger/AzurePurger.php                               
 ------ ---------------------------------------------------------------------- 
  149    \Drupal calls should be avoided in classes, use dependency injection  
         instead                                                               
  174    \Drupal calls should be avoided in classes, use dependency injection  
         instead                                                               
 ------ ----------------------------------------------------------------------

I'm referring to the line 68 issue.

Some of the spelling failures are spelling errors that should be fixed. Some can be ignored in .gitlab-ci.yml by setting _CSPELL_WORDS.

This gets the GitLab tests working without errors, just warnings on some dependency injection. Will close this ticket and we can fix dependency injection issues in separate ticket.

Automatically closed - issue fixed for 2 weeks with no activity.