cnl

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• [x] Wait on release of Clang-12, GCC-11 and Ubuntu 21.04
• [x] Fix ccache for all compilers and Clang-Tidy
• [x] Use the gist mentioned here
• [ ] Get Docker Hub to build images?
• [x] markdownlint
• [x] cmakelint
• [ ] iwyu w. c++20 support
• [x] remove apt-get install and snap install from test.yml
• [ ] consider a freestanding image like this one
• [ ] run tests of ARM builds using QEMU, as @ckormanyos mentions here
• [ ] move cnl_ci_images into cnl/.github/
• [ ] streamline images using this technique

Clang-Tidy doesn't work with ccache