[Question] How to create prebuilt version of sdk from scripts

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### [REQUIRED] Please fill in the following fields:

* Pre-built SDK from the [website](https://firebase.google.com/download/cpp) or open-source from this repo: open-source from this repo
* Firebase C++ SDK version: 12.5.0
* Main Firebase Components in concern: all
* Other Firebase Components in use: all
* Platform you are using the C++ SDK on: Linux
* Platform you are targeting: desktop (iOS, Android, and/or desktop)

### [REQUIRED] Please describe the question here:

What's up guys. Sorry for stupid (maybe) question.

I build firebase sdk from sources.
How can I get prebuilt versrion of sdk from script?

I invoke:
`./build_scripts/desktop/package.sh -b /home/era/Work/firebase-cpp-sdk/build -o /home/era/Work/firebase-cpp-sdk/release -p linux -t /usr/bin -j 28 -L`

But, there are no some include files and folders. Here what i get.



But, if we look at the prebuilt version of sdk (zip file) you will see more files
For ex, the include files from prebuilt version


As you can see, there are more files.
What I do wrong?

Start with build_scripts/desktop/package.sh and reproduce the supplied command using the stated build and output paths. Compare its generated include tree with the downloaded prebuilt SDK and trace which packaging inputs control the differences. Done means identifying the correct invocation or documenting the repository-side packaging gap.

Written by the indexing model from the issue text.