Build git-annex on macOS ARM64 #171

Job	Run time
build-package	8m 33s
test-annex (normal, macos-15)	10s
test-datalad (master)	6s
test-datalad (maint)	7s
test-annex (normal, macos-latest)	8s
test-annex (custom-config1, macos-15)	8s
test-annex (crippled-tmp, macos-15)	8s
test-annex-more	9s
test-datalad (release)	9s
	9m 38s

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