packaging tvos libraries as a post step

Author: vimanyu

.github/workflows/cpp-packaging.yml

@@ -168,6 +168,7 @@ jobs:
         run: |
           python sdk-src/scripts/gha/build_ios_tvos.py -b firebase-cpp-sdk-ios-tvos-build -s sdk-src
           sdk-src/build_scripts/ios/package.sh firebase-cpp-sdk-ios-tvos-build firebase-cpp-sdk-ios-tvos-package
+          sdk-src/build_scripts/tvos/package.sh firebase-cpp-sdk-ios-tvos-build firebase-cpp-sdk-ios-tvos-package
           cd firebase-cpp-sdk-ios-tvos-package
           tar -czhf ../firebase-cpp-sdk-ios-tvos-package.tgz .