ci: build platform ruby_wasm gems for Ruby 4.0 #760

Job	Run time
ci-data	5s
Push source gem	0s
Compile native gem for aarch64-linux	5m 53s
Compile native gem for x64-mingw-ucrt	5m 58s
Compile native gem for x86_64-darwin	5m 46s
Compile native gem for x86_64-linux	9m 29s
Compile native gem for aarch64-linux-musl	6m 6s
Compile native gem for arm64-darwin	5m 36s
Compile native gem for x86_64-linux-musl	5m 48s
	44m 41s

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