Build git-annex on macOS ARM64 #100

Job	Run time
build-package	9m 28s
test-annex-more	18s
test-datalad (master)	1h 43m 1s
test-annex (normal, macos-15)	6m 31s
test-annex (crippled-tmp, macos-15)	7m 19s
test-annex (normal, macos-latest)	4m 24s
test-annex (custom-config1, macos-15)	5m 4s
test-datalad (maint)	1h 41m 2s
test-datalad (release)	1h 42m 26s
	5h 39m 33s

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