ENH: Add CTestConfig.cmake.
ENH: Add CTestConfig.cmake.

When tests are run with Docker, etc, the results are uploaded to

  https://open.cdash.org/index.php?project=Insight

InsightSoftwareConsortium/ITKIOOpenSlide,InsightSoftwareConsortium/ITKIOOpenSlide,InsightSoftwareConsortium/ITKIOOpenSlide