Added step to enable startup file if it exists

Author: itzandroidtab

.github/workflows/build.yml

@@ -65,7 +65,12 @@ jobs:
 
           echo "Contents of main:"
           cat ${{github.workspace}}/project/main.cpp
-      
+
+      - name: Add startup file (if it exists)
+        if: ${{ hashFiles('${{github.workspace}}/targets/chip/${{matrix.cpu}}/startup.cpp') != '' }}
+        run: |
+          sed -i '6 s/# //' ./project/CMakeLists.txt
+
       - name: Configure CMake
         # Configure CMake in a 'build' subdirectory. `CMAKE_BUILD_TYPE` is only required if you are using a single-configuration generator such as make.
         # See https://cmake.org/cmake/help/latest/variable/CMAKE_BUILD_TYPE.html?highlight=cmake_build_type