tests

Document why binary data is set #730

Job	Run time
Building Linux libraries	3m 33s
Building macOS libraries	1m 6s
Building Windows libraries	2m 33s
Testing with Valgrind on ubuntu-latest	1m 56s
Building Android libraries	3m 34s
Basic WASM build	1m 58s
Build XCFramework	6m 28s
Rust unit tests on macos-latest	1m 22s
Rust unit tests on ubuntu-24.04	2m 36s
Testing on ubuntu-24.04	1m 21s
Testing on macos-latest	51s
Testing on windows-11-arm	1m 2s
Testing on windows-latest	1m 4s
Testing on ubuntu-arm64	1m 43s
	31m 7s

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