fixup! fixup! fixup! fixup! fixup! fixup! fixup! ci: add clang_tidy to the CI

Author: VJanKraemer

.github/workflows/sil-kit-ci.yml

@@ -72,6 +72,7 @@ jobs:
         id: clang-tidy
         run: |
           mkdir _o
+          export CC=clang && export CXX=clang++
           cmake -S . -B build_tidy -GNinja -DSILKIT_BUILD_DASHBOARD=OFF -DSILKIT_BUILD_DEMOS=ON -DCMAKE_EXPORT_COMPILE_COMMANDS=ON -DCMAKE_BUILD_TYPE=RelWithDebInfo
           python3 ./SilKit/ci/silkit_clang_tidy.py build_tidy/ _o/
         shell: bash