add loongarch CI #745

Job	Run time
test (x86_64-unknown-linux-gnu, stable)	33s
test (x86_64-unknown-linux-gnu, nightly)	34s
test (aarch64-unknown-linux-gnu, stable)	1m 0s
test (aarch64-unknown-linux-gnu, nightly)	35s
test (armv7-unknown-linux-gnueabihf, stable)	53s
test (armv7-unknown-linux-gnueabihf, nightly)	34s
test (riscv64gc-unknown-linux-gnu, stable)	57s
test (riscv64gc-unknown-linux-gnu, nightly)	34s
test (s390x-unknown-linux-gnu, stable)	56s
test (s390x-unknown-linux-gnu, nightly)	33s
test (loongarch64-unknown-linux-gnu, stable)	1m 0s
test (loongarch64-unknown-linux-gnu, nightly)	40s
test (x86_64-apple-darwin, stable)	5m 20s
test (x86_64-apple-darwin, nightly)	5m 20s
test (aarch64-apple-darwin, stable)	4m 35s
test (aarch64-apple-darwin, nightly)	5m 4s
test (x86_64-pc-windows-gnu, stable)	5m 34s
test (x86_64-pc-windows-gnu, nightly)	5m 20s
test (x86_64-pc-windows-msvc, stable)	8m 0s
test (x86_64-pc-windows-msvc, nightly)	7m 57s
test (i686-pc-windows-gnu, stable)	10m 23s
test (i686-pc-windows-gnu, nightly)	10m 1s
test (i686-pc-windows-msvc, stable)	6m 42s
test (i686-pc-windows-msvc, nightly)	6m 28s
	1h 29m 33s

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