github-ci - add make format-check to github pipeline

In this commit, we introduce a new step to the GitHub Continuous Integration (CI) pipeline to ensure code formatting consistency.
The newly added step runs the 'make format-check' command on the project's source code, specifically targeting `.cpp` and `.hpp` files.
By including 'make format-check' in the CI pipeline, we automate the process of checking code formatting for every code change pushed to the repository.
The pipeline will fail if any code formatting violations are detected, providing immediate feedback to developers, encouraging them to address formatting issues before merging their changes.

.github/workflows/c-cpp.yml

@@ -25,6 +25,8 @@ jobs:
       run: autoreconf -i
     - name: configure
       run: ./configure --with-raw --with-pcap --with-nemea --with-gtest
+    - name: make format-check
+      run: make format-check
     - name: make
       run: make
     - name: make check