Add native CI for Aarch64 #1742

Job	Run time
build (--test-successful-rustc --nb-parts 2 --current-part 1)	2m 13s
build (--test-libcore)	1m 13s
build (--test-successful-rustc --nb-parts 2 --current-part 0)	1m 16s
build (--std-tests)	2m 29s
build (--mini-tests)	1m 10s
success_gcc12	3s
	8m 24s

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