Load Xdebug for end-to-end tests

Author: sebastianbergmann

.github/workflows/ci.yaml

@@ -233,7 +233,7 @@ jobs:
 
     env:
       PHP_EXTENSIONS: none, ctype, curl, dom, json, libxml, mbstring, openssl, pdo, phar, soap, tokenizer, xml, xmlwriter, pcntl
-      PHP_INI_VALUES: assert.exception=1, zend.assertions=1, error_reporting=-1, log_errors_max_len=0, display_errors=On
+      PHP_INI_VALUES: assert.exception=1, zend.assertions=1, error_reporting=-1, log_errors_max_len=0, display_errors=On, xdebug.mode=off
 
     strategy:
       fail-fast: false
@@ -275,6 +275,7 @@ jobs:
           php-version: ${{ matrix.php-version }}
           extensions: ${{ env.PHP_EXTENSIONS }}
           ini-values: ${{ env.PHP_INI_VALUES }}
+          coverage: xdebug
           tools: none
 
       - name: Get Composer cache directory