add loongarch CI #747

Job	Run time
test (x86_64-unknown-linux-gnu, stable)	6m 24s
test (x86_64-unknown-linux-gnu, nightly)	28s
test (aarch64-unknown-linux-gnu, stable)	2m 56s
test (aarch64-unknown-linux-gnu, nightly)	29s
test (armv7-unknown-linux-gnueabihf, stable)	2m 31s
test (armv7-unknown-linux-gnueabihf, nightly)	33s
test (riscv64gc-unknown-linux-gnu, stable)	2m 23s
test (riscv64gc-unknown-linux-gnu, nightly)	29s
test (s390x-unknown-linux-gnu, stable)	2m 48s
test (s390x-unknown-linux-gnu, nightly)	34s
test (loongarch64-unknown-linux-gnu, stable)	2m 12s
test (loongarch64-unknown-linux-gnu, nightly)	43s
test (x86_64-apple-darwin, stable)	2m 13s
test (x86_64-apple-darwin, nightly)	2m 42s
test (aarch64-apple-darwin, stable)	4m 10s
test (aarch64-apple-darwin, nightly)	4m 40s
test (x86_64-pc-windows-gnu, stable)	5m 22s
test (x86_64-pc-windows-gnu, nightly)	3m 35s
test (x86_64-pc-windows-msvc, stable)	6m 8s
test (x86_64-pc-windows-msvc, nightly)	6m 33s
test (i686-pc-windows-gnu, stable)	8m 45s
test (i686-pc-windows-gnu, nightly)	8m 45s
test (i686-pc-windows-msvc, stable)	4m 13s
test (i686-pc-windows-msvc, nightly)	3m 18s
	1h 22m 54s

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