Build git-annex on macOS ARM64 #106

Job	Run time
build-package	10m 27s
test-annex-more	24s
test-annex (normal, macos-15)	5m 25s
test-datalad (master)	1h 51m 3s
test-datalad (release)	1h 46m 2s
test-annex (crippled-tmp, macos-15)	7m 27s
test-annex (normal, macos-latest)	5m 44s
test-datalad (maint)	2h 3m 47s
test-annex (custom-config1, macos-15)	5m 21s
	6h 15m 40s

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