ci: fixed coverage not installed on ci

Author: carloeusebi

.github/workflows/tests.yml

@@ -24,7 +24,7 @@ jobs:
         with:
           php-version: ${{ matrix.php }}
           extensions: dom, mbstring, zip
-          coverage: none
+          coverage: xdebug
 
       - name: Get Composer cache directory
         id: composer-cache