Add CI for Aarch64 #2948

Job	Run time
build_system	28s
spell_check	10s
duplicates	4s
build (gcc-15.deb, --test-libcore)	16m 56s
build (gcc-15.deb, --std-tests)	7m 18s
build (gcc-15.deb, --extended-rand-tests)	9m 50s
build (gcc-15.deb, --test-successful-rustc --nb-parts 2 --current-part 0)	14m 13s
build (gcc-15.deb, --projects)	11m 32s
build (gcc-15.deb, --test-successful-rustc --nb-parts 2 --current-part 1)	15m 12s
build (gcc-15.deb, --extended-regex-tests)	12m 49s
build (gcc-15-without-int128.deb, --std-tests)	7m 16s
build (gcc-15.deb, --extended-regex-example-tests)	6m 47s
build (gcc-15-without-int128.deb, --extended-regex-example-tests)	6m 42s
build (gcc-15-without-int128.deb, --test-successful-rustc --nb-parts 2 --current-part 0)	13m 12s
build (gcc-15-without-int128.deb, --projects)	12m 35s
build (gcc-15-without-int128.deb, --test-successful-rustc --nb-parts 2 --current-part 1)	14m 46s
build (gcc-15-without-int128.deb, --extended-regex-tests)	13m 38s
build (gcc-15-without-int128.deb, --extended-rand-tests)	9m 39s
build (gcc-15-without-int128.deb, --test-libcore)	17m 27s
success	2s
	3h 10m 36s

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