explicitly add DUNECI_PARALLEL - this seems not to be required for the

core module setup?

.gitlab-ci.yml

@@ -3,6 +3,7 @@ variables:
   # DUNECI_TOOLCHAIN:   gcc-7-17
   DUNE_CONTROL_PATH:  /duneci/modules:$CI_PROJECT_DIR
   DUNE_PY_DIR:        /duneci/modules/dune-py
+  DUNECI_PARALLEL:    ON
   PYTHONPATH:         "/duneci/modules/dune-common/build-cmake/python:/duneci/modules/dune-geometry/build-cmake/python:/duneci/modules/dune-grid/build-cmake/python:/duneci/modules/dune-istl/build-cmake/python:/duneci/modules/dune-alugrid/build-cmake/python:/duneci/modules/dune-fem/build-cmake/python:$CI_PROJECT_DIR/build-cmake/python"
 
 before_script: