Fix "invisible" CI tests #2

Job	Run time
integration-dummy / Run dummy	1m 22s
adaptivity-serial / Unit and integration tests	1m 9s
pip-install / test-pip-install	1m 6s
build-cache / Build and cache OpenMPI 5	39s
domain-decomp / Run domain decomposition unit tests	1m 5s
coverage / Run test coverage check	1m 9s
unit-tests / unit_tests	1m 7s
adaptivity-parallel / Unit tests	1m 8s
adaptivity-parallel / Integration tests	1m 12s
	9m 57s

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