Build git-annex on macOS ARM64 #117

Job	Run time
build-package	9m 38s
test-annex-more	22s
test-datalad (maint)	1h 50m 33s
test-datalad (release)	1h 43m 18s
test-annex (normal, macos-latest)	6m 27s
test-annex (custom-config1, macos-15)	6m 58s
test-annex (normal, macos-15)	6m 42s
test-datalad (master)	1h 51m 41s
test-annex (crippled-tmp, macos-15)	8m 4s
	6h 3m 43s

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