Build git-annex on macOS ARM64 #109

Job	Run time
build-package	7m 58s
test-annex-more	18s
test-annex (crippled-tmp, macos-15)	7m 7s
test-annex (normal, macos-15)	5m 27s
test-datalad (release)	1h 43m 6s
test-datalad (maint)	1h 50m 4s
test-annex (normal, macos-latest)	5m 30s
test-datalad (master)	1h 42m 40s
test-annex (custom-config1, macos-15)	7m 8s
	5h 49m 18s

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