[ISSUE #231] Enhance CI #485

Job	Run time
test (x86_64-unknown-linux-gnu, stable)	4m 35s
test (x86_64-unknown-linux-gnu, nightly)	4m 40s
test (i686-unknown-linux-gnu, stable)	1m 52s
test (i686-unknown-linux-gnu, nightly)	1m 34s
test (aarch64-unknown-linux-gnu, stable)	3m 21s
test (aarch64-unknown-linux-gnu, nightly)	1m 51s
test (armv7-unknown-linux-gnueabihf, stable)	1m 28s
test (armv7-unknown-linux-gnueabihf, nightly)	1m 44s
test (riscv64gc-unknown-linux-gnu, stable)	1m 35s
test (riscv64gc-unknown-linux-gnu, nightly)	1m 24s
test (s390x-unknown-linux-gnu, stable)	1m 31s
test (s390x-unknown-linux-gnu, nightly)	1m 50s
test (x86_64-apple-darwin, stable)	1m 59s
test (x86_64-apple-darwin, nightly)	2m 34s
test (aarch64-apple-darwin, stable)	1m 55s
test (aarch64-apple-darwin, nightly)	2m 6s
	35m 59s

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