PHPUnitCommand: Disable memory limit for phpdbg run

This is to prevent memory exhausted error when test coverage is
requested.

Author: kabalin

docs/CHANGELOG.md

@@ -14,6 +14,10 @@ The format of this change log follows the advice given at [Keep a CHANGELOG](htt
   This resolves an issue where an "Unable to find local grunt" message was reported when code was structured in a legacy
   format. See #46 for more details.
 
+### Changed
+- `moodle-plugin-ci phpunit` when coverage report is included, phpdbg is called with ignore memory limits param
+  to avoid memory exhaused errors.
+
 ## [3.0.3] - 2020-10-16
 ### Changed
 - Updated version of [moodle-local_codechecker](https://github.com/moodlehq/moodle-local_codechecker) to v2.9.8.

src/Command/PHPUnitCommand.php

@@ -99,7 +99,7 @@ private function resolveBinary(InputInterface $input)
             return '';
         }
 
-        return 'phpdbg -qrr ';
+        return 'phpdbg -d memory_limit=-1 -qrr ';
     }
 
     /**