Add explanation for why different workspace #432

Job	Run time
Test (ubuntu-24.04, aarch64-linux-android, x86_64-unknown-linux-gnu)	9m 42s
Test (windows-2022, x86_64-pc-windows-msvc)	37m 53s
Lint	5m 50s
Test (ubuntu-24.04, x86_64-unknown-linux-gnu)	21m 35s
cargo-deny	52s
Test (macOS-latest, x86_64-apple-darwin)	22m 28s
test_success	2s
	1h 38m 22s

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