(MOD) Modified github action file for testing for extra step required by project.

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

@@ -75,3 +75,7 @@ jobs:
       # Execute tests defined by the CMake configuration. Note that --build-config is needed because the default Windows generator is a multi-config generator (Visual Studio generator).
       # See https://cmake.org/cmake/help/latest/manual/ctest.1.html for more detail
       run: ctest --build-config ${{ matrix.build_type }}
+    
+    - name: Install
+      # By running "install" script to install project header files and shared object file later on after the compilation.
+      run: ./install