Build git-annex on macOS ARM64 #146

Job	Run time
build-package	12m 31s
test-annex-more	26s
test-datalad (maint)	1h 43m 35s
test-datalad (release)	1h 45m 21s
test-annex (normal, macos-latest)	6m 33s
test-datalad (master)	1h 47m 25s
test-annex (crippled-tmp, macos-15)	8m 50s
test-annex (custom-config1, macos-15)	4m 57s
test-annex (normal, macos-15)	5m 22s
	5h 55m 0s

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