Build git-annex on macOS ARM64 #144

Job	Run time
build-package	8m 38s
test-annex-more	20s
test-datalad (release)	1h 56m 17s
test-datalad (maint)	1h 49m 40s
test-annex (normal, macos-latest)	4m 50s
test-annex (custom-config1, macos-15)	5m 8s
test-annex (crippled-tmp, macos-15)	7m 20s
test-datalad (master)	1h 52m 3s
test-annex (normal, macos-15)	5m 17s
	6h 9m 33s

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