feat: add loongarch64-unknown-linux-gnu image #4176

Job	Run time
cargo-deny	22s
clippy (macos-latest)	52s
check	23s
clippy (ubuntu-latest)	31s
fmt	18s
clippy (windows-latest)	1m 45s
generate-matrix	24s
shellcheck	12s
test (macos-latest)	1m 22s
test (ubuntu-latest)	1m 8s
test (windows-latest)	3m 19s
bisect	3m 42s
remote	2m 1s
foreign	2m 52s
podman	2m 33s
docker-in-docker	4m 20s
target (${{ matrix.pretty }},${{ matrix.os }})	0s
publish	0s
conclusion	3s
Coverage	19s
	26m 26s

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