Build git-annex on macOS #2305

Job	Run time
build-package	18m 47s
test-annex-more	33s
test-datalad (master)	1h 49m 58s
test-annex (normal, macos-latest-large)	1h 27m 40s
test-annex (normal, macos-15-intel)	6m 26s
test-datalad (maint)	1h 59m 17s
test-annex (crippled-tmp, macos-15-intel)	12m 16s
test-datalad (release)	2h 6m 25s
test-annex (custom-config1, macos-15-intel)	9m 14s
	8h 10m 36s

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