Rust

Add GitHub style alerts / admonitions #1180

Job	Run time
build_bin_spec (nightly)	1m 1s
build_lib_test (nightly)	49s
build_wasm (nightly)	50s
build_lib_test (beta)	1m 6s
build_wasm (beta)	46s
build_lib_test (stable)	1m 9s
build_wasm (stable)	42s
build_bin_spec (beta)	58s
build_lib_test ($MSRV)	2m 48s
build_wasm ($MSRV)	2m 25s
build_bin_spec (stable)	1m 7s
build_bin_spec ($MSRV)	2m 36s
clippy_format	2m 7s
lockfile	55s
no_features_build_test (nightly)	24s
no_features_build_test (beta)	30s
no_features_build_test (stable)	36s
no_features_build_test ($MSRV)	1m 53s
	22m 42s

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