Add `cargo check` for loongarch64 target #3861

Job	Run time
Check ${{ matrix.platform.target }}	0s
Generate Matrix	7s
Test Auditwheel	0s
Test Alpine Linux	0s
Test Bootstrap (ubuntu-latest)	2m 31s
Test Cross Compile	0s
Test Bootstrap (macos-14)	3m 3s
Test Docker	0s
Test downstream - ${{ matrix.downstream.repository }}	0s
Test Bootstrap (windows-latest)	8m 22s
Test Emscripten	0s
Test MSRV	2m 9s
Test Pyston	0s
Test (ubuntu-latest, 3.12)	25m 53s
Test (ubuntu-latest, pypy3.10)	10m 20s
Test (macos-14, 3.12)	7m 21s
Test (windows-latest, 3.12)	19m 23s
Test (windows-latest, pypy3.10)	19m 21s
conclusion	1s
	1h 38m 31s

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