enable gitlab support for code coverage

.gitlab-ci.yml

@@ -9,6 +9,8 @@ before_script:
   - php -r "if (hash_file('SHA384', 'composer-setup.php') === file_get_contents('installer.sig')) { echo 'Installer verified'; } else { echo 'Installer corrupt'; unlink('composer-setup.php'); } echo PHP_EOL;"
   - php composer-setup.php
   - php -r "unlink('composer-setup.php'); unlink('installer.sig');"
+  - pecl install xdebug
+  - docker-php-ext-enable xdebug
 
 cache:
   paths: