Build and run the test program
This merge request adds the parallel/ddd/basic/test/
subdirectory to CMakeLists.txt
and switches to dune_add_test
to build the test program.
It also updates .gitlab-ci.yml
to match the DUNE core modules. In particular it now builds the dune-common
dependency instead of using the pre-build version from the duneci/dune:git
image.