Build git-annex on macOS ARM64 #103

Job	Run time
build-package	8m 36s
test-annex-more	24s
test-datalad (maint)	1h 38m 13s
test-datalad (master)	1h 44m 0s
test-annex (normal, macos-latest)	4m 23s
test-annex (normal, macos-15)	6m 25s
test-annex (crippled-tmp, macos-15)	6m 54s
test-datalad (release)	1h 40m 39s
test-annex (custom-config1, macos-15)	7m 7s
	5h 36m 41s

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