Cmake-infrastructure for tests and CI-setup for Levante

MR to prepare CMake-scripting and CI setup for unittests

mentioned in merge request !5 (closed)

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• f9a9ea84 - move bugfix to another MR

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• 645c2f34 - cleanup gitignore

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added 1 commit

• a3687447 - cleanup CMakelist

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changed title from Cmake-infrastructure for tests to Cmake-infrastructure for tests and CI-setup for Levante

added 5 commits

• a3687447...e3ac319a - 4 commits from branch master
• 308ec25f - Merge branch 'master' of gitlab.dkrz.de:icon-libraries/libfortran-support into cmake_for_tests

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@m300488 @b381660 Can you do a review?

LGTM. Thanks for splitting it up.

42 commits for 5 files. I would definitely squash this :)

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• 9cbd0162 - fetch googletest from url

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Sorry, I always forget to put the comments into one message :(