Update tests.yml (#1540)

Author: driesvints

.github/workflows/tests.yml

@@ -32,6 +32,7 @@ jobs:
         with:
           php-version: ${{ matrix.php }}
           extensions: dom, curl, libxml, mbstring, zip, pcntl, pdo, sqlite, pdo_sqlite, bcmath, soap, intl, gd, exif, iconv, imagick
+          ini-values: error_reporting=E_ALL
           tools: composer:v2
           coverage: none