Build git-annex on macOS ARM64 #126

Job	Run time
build-package	8m 57s
test-annex-more	25s
test-datalad (maint)	1h 59m 4s
test-annex (crippled-tmp, macos-15)	8m 29s
test-annex (normal, macos-15)	4m 52s
test-datalad (master)	1h 44m 58s
test-annex (normal, macos-latest)	5m 6s
test-datalad (release)	1h 48m 18s
test-annex (custom-config1, macos-15)	5m 15s
	6h 5m 24s

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