[ISSUE #231] Enhance CI #486

Job	Run time
test (x86_64-unknown-linux-gnu, stable)	4m 33s
test (x86_64-unknown-linux-gnu, nightly)	4m 38s
test (i686-unknown-linux-gnu, stable)	2m 11s
test (i686-unknown-linux-gnu, nightly)	1m 26s
test (aarch64-unknown-linux-gnu, stable)	1m 46s
test (aarch64-unknown-linux-gnu, nightly)	1m 54s
test (armv7-unknown-linux-gnueabihf, stable)	1m 24s
test (armv7-unknown-linux-gnueabihf, nightly)	1m 37s
test (riscv64gc-unknown-linux-gnu, stable)	1m 34s
test (riscv64gc-unknown-linux-gnu, nightly)	1m 31s
test (s390x-unknown-linux-gnu, stable)	1m 38s
test (s390x-unknown-linux-gnu, nightly)	1m 41s
test (x86_64-apple-darwin, stable)	2m 18s
test (x86_64-apple-darwin, nightly)	3m 21s
test (aarch64-apple-darwin, stable)	1m 24s
test (aarch64-apple-darwin, nightly)	1m 34s
	34m 30s

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