Files changed in the subdirectory

[ridefox-pshetty]

Hi,
I am writing ad GitHub yaml file to detect the file changes in any of the below modules.

In my case I have a directory structure called as
src/modules1
src/modules2
src/modules3 and so on.
Each module will contain source files, header files and doc files.
What is efficient way check for changes into the .c or .h files?

Pradeep