Update cmake-multi-platform.yml

Author: eel76

.github/workflows/cmake-multi-platform.yml

@@ -81,5 +81,5 @@ jobs:
 
     - name: Check formatting
       run: |
-        find . -name '*.cpp' -o -name '*.h' |
+        find examples include tests -name '*.cpp' -o -name '*.h' |
         xargs clang-format -style=file -i --dry-run --Werror