[ISSUE #231] Enhance CI #488

Job	Run time
test (x86_64-unknown-linux-gnu, stable)	4m 47s
test (x86_64-unknown-linux-gnu, nightly)	4m 49s
test (i686-unknown-linux-gnu, stable)	2m 18s
test (i686-unknown-linux-gnu, nightly)	1m 26s
test (aarch64-unknown-linux-gnu, stable)	3m 24s
test (aarch64-unknown-linux-gnu, nightly)	1m 38s
test (armv7-unknown-linux-gnueabihf, stable)	1m 23s
test (armv7-unknown-linux-gnueabihf, nightly)	1m 41s
test (riscv64gc-unknown-linux-gnu, stable)	1m 29s
test (riscv64gc-unknown-linux-gnu, nightly)	1m 27s
test (s390x-unknown-linux-gnu, stable)	1m 41s
test (s390x-unknown-linux-gnu, nightly)	1m 43s
test (x86_64-apple-darwin, stable)	2m 19s
test (x86_64-apple-darwin, nightly)	4m 19s
test (aarch64-apple-darwin, stable)	1m 38s
test (aarch64-apple-darwin, nightly)	1m 34s
	37m 36s

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