execute legacy test framework only with mysql

Author: s3inlc

.github/workflows/ci.yml

@@ -28,6 +28,7 @@ jobs:
       - name: Give Apache permissions on necessary directories # for the tests, only src/files and src/inc/utils/locks seem necessary
         run: docker exec -u root hashtopolis-server-dev bash -c "chown -R www-data:www-data /var/www/html/src && chmod -R g+w /var/www/html/src"
       - name: Run test suite
+        if: ${{ matrix.db_system == 'mysql' }} # the legacy is only supposed to work with mysql
         run: docker exec hashtopolis-server-dev php /var/www/html/ci/run.php -vmaster
       - name: Test with pytest
         run: docker exec hashtopolis-server-dev pytest /var/www/html/ci/apiv2