ci: debug failures

Author: innocenzi

.github/workflows/isolated-tests.yml

@@ -80,4 +80,4 @@ jobs:
           composer update --${{ matrix.stability }} --prefer-dist --no-interaction
 
       - name: Execute tests
-        run: phpunit --display-all-issues -c "packages/${{ matrix.package.basename }}/phpunit.xml"
+        run: php -d display_errors=1 phpunit --display-all-issues -c "packages/${{ matrix.package.basename }}/phpunit.xml"