Reduce disk space usage when packaging the built SDK (#763)

Remove intermediate build files during desktop packaging step.

This should reduce the disk space usage, as those files (*.o and *.obj) are not required when merging libraries.

Author: jonsimantov

.github/workflows/cpp-packaging.yml

@@ -433,6 +433,8 @@ jobs:
         run: |
           cd out-sdk
           find .. -type f -print > src_file_list.txt
+          # Remove intermediate build files (.o and .obj) files to save space.
+          find . -type f -name '*.o' -or -name '*.obj' -print0 | xargs -0 rm -f --
           tar -czhf ../firebase-cpp-sdk-${{ env.SDK_NAME }}-build.tgz .
 
       - name: Print built libraries