ci: use setup-ruby before using rake #737

Job	Run time
ci-data	5s
Compile native gem for x86_64-linux	6m 6s
Compile native gem for x86_64-linux-musl	6m 5s
Compile native gem for x86_64-darwin	6m 2s
Compile native gem for arm64-darwin	6m 7s
Compile native gem for x64-mingw-ucrt	5m 55s
Compile native gem for aarch64-linux-musl	6m 40s
Compile native gem for aarch64-linux	6m 9s
	43m 9s

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