feat: add loongarch64-unknown-linux-gnu image #4173

Job	Run time
clippy (macos-latest)	51s
cargo-deny	28s
check	36s
clippy (ubuntu-latest)	35s
fmt	15s
clippy (windows-latest)	1m 1s
generate-matrix	26s
shellcheck	11s
test (macos-latest)	1m 22s
test (ubuntu-latest)	1m 3s
test (windows-latest)	1m 10s
foreign	0s
target (${{ matrix.pretty }},${{ matrix.os }})	0s
bisect	0s
remote	0s
podman	0s
docker-in-docker	0s
publish	0s
conclusion	1s
Coverage	0s
	7m 59s

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