Refactor GitHub Actions workflow for native builds

Author: mcbarton

.github/workflows/main.yml

@@ -263,6 +263,7 @@ jobs:
         vers="${CC#*-}"
         lcov --directory build/ --capture --output-file coverage.info --gcov-tool /usr/bin/gcov-${vers}
         lcov --remove coverage.info '/usr/*' ${{ github.workspace }}'/llvm-project/*' ${{ github.workspace }}'/unittests/*' --output-file coverage.info
+        # output coverage data for debugging (optional)
         lcov --list coverage.info
 
     - name: Upload to codecov.io
@@ -294,3 +295,4 @@ jobs:
 
 
 
+