prepare release 0.30.0 (#1189) #3

Job	Run time
test (ubuntu-latest)	11m 50s
Build x86_64-unknown-linux-musl	10m 45s
test (macos-latest)	11m 45s
Build aarch64-unknown-linux-musl	10m 46s
test (windows-latest)	20m 38s
Build powerpc64le-unknown-linux-gnu	10m 41s
Build x86_64-apple-darwin	25m 30s
Build aarch64-apple-darwin	20m 5s
Build x86_64-pc-windows-gnu	21m 0s
Build x86_64-pc-windows-msvc	21m 0s
Post-process	2s
	2h 44m 2s

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