add loongarch CI #742

Job	Run time
test (x86_64-unknown-linux-gnu, stable)	4m 15s
test (x86_64-unknown-linux-gnu, nightly)	24s
test (aarch64-unknown-linux-gnu, stable)	6m 19s
test (aarch64-unknown-linux-gnu, nightly)	25s
test (armv7-unknown-linux-gnueabihf, stable)	4m 3s
test (armv7-unknown-linux-gnueabihf, nightly)	24s
test (riscv64gc-unknown-linux-gnu, stable)	2m 36s
test (riscv64gc-unknown-linux-gnu, nightly)	22s
test (s390x-unknown-linux-gnu, stable)	2m 35s
test (s390x-unknown-linux-gnu, nightly)	25s
test (loongarch64-unknown-linux-gnu, stable)	44s
test (loongarch64-unknown-linux-gnu, nightly)	27s
test (x86_64-apple-darwin, stable)	3m 17s
test (x86_64-apple-darwin, nightly)	26s
test (aarch64-apple-darwin, stable)	7m 13s
test (aarch64-apple-darwin, nightly)	24s
test (x86_64-pc-windows-gnu, stable)	5m 40s
test (x86_64-pc-windows-gnu, nightly)	1m 11s
test (x86_64-pc-windows-msvc, stable)	7m 47s
test (x86_64-pc-windows-msvc, nightly)	1m 10s
test (i686-pc-windows-gnu, stable)	11m 17s
test (i686-pc-windows-gnu, nightly)	1m 11s
test (i686-pc-windows-msvc, stable)	7m 58s
test (i686-pc-windows-msvc, nightly)	1m 17s
	1h 11m 50s

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