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Reuse Ruby builds when static gem extensions are unchanged #830

Job	Run time
ci-data	6s
Push source gem	-1s
Compile native gem for arm64-darwin	5m 3s
Compile native gem for x86_64-linux	11m 7s
Compile native gem for x86_64-linux-musl	6m 54s
Compile native gem for x64-mingw-ucrt	6m 52s
Compile native gem for aarch64-linux	7m 11s
Compile native gem for x86_64-darwin	6m 11s
Compile native gem for aarch64-linux-musl	7m 27s
	50m 50s