Rust

Add GitHub style alerts / admonitions #1186

Job	Run time
build_lib_test (nightly)	50s
build_bin_spec (nightly)	58s
build_lib_test (beta)	59s
lockfile	1m 12s
build_bin_spec (beta)	58s
build_wasm (nightly)	48s
build_lib_test (stable)	1m 2s
build_bin_spec (stable)	1m 7s
build_wasm (beta)	52s
build_lib_test ($MSRV)	2m 52s
build_bin_spec ($MSRV)	2m 41s
build_wasm (stable)	51s
no_features_build_test (nightly)	25s
no_features_build_test (beta)	29s
build_wasm ($MSRV)	2m 31s
no_features_build_test (stable)	29s
no_features_build_test ($MSRV)	1m 58s
clippy_format	2m 15s
	23m 17s

Provide feedback