add workflow to test rust clients #668

Job	Run time
Build Rust (samples/server/petstore/rust-server/)	3m 40s
Build Rust (samples/client/petstore/rust/)	1m 14s
Build Rust (samples/server/petstore/rust-axum/)	2m 42s
Build Rust (samples/server/petstore/rust-server-deprecated/)	4m 6s
Build Rust (samples/client/others/rust/)	1m 21s
	13m 3s

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