general: set CXX to clang++ in clang-tidy check

.gitlab-ci.yml

@@ -138,6 +138,8 @@ static-analysis:cppcheck:
 static-analysis:clang-tidy:
   extends: .template:static-analysis
+  variables:
+    CXX: clang++
   script:
     - clang-tidy --version
     - jq ".[].file" build/compile_commands.json | tr -d "\"" | grep -v "test-src" | xargs -n1 -P$(grep -c processor /proc/cpuinfo) clang-tidy -quiet -p build/