Rust

Use secp256k1 for validator keys. #12308

Job	Run time
execution-wasmtime-test	1m 20s
remote-net-test	14m 38s
wasm-application-test	10m 17s
check-outdated-cli-md	1m 46s
benchmark-test	7m 34s
ethereum-tests	8m 58s
default-features-and-witty-integration-test	32m 29s
lint-cargo-doc	4m 21s
lint-cargo-clippy	12m 6s
lint-cargo-machete	26s
lint-cargo-fmt	28s
lint-cargo-sort	28s
lint-check-copyright-headers	15s
lint-check-for-outdated-readme	38s
lint-unexpected-chain-load-operations	4s
lint-wasm-applications	3m 41s
storage-service-tests	25m 45s
web	5m 53s
lint-check-all-features	33m 56s
lint-check-linera-service-graphql-schema	1m 13s
	2h 46m 16s

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