Build git-annex on macOS ARM64 #172

Job	Run time
build-package	8m 55s
test-datalad (maint)	5s
test-annex (crippled-tmp, macos-15)	9s
test-annex (custom-config1, macos-15)	9s
test-datalad (release)	7s
test-annex (normal, macos-latest)	10s
test-datalad (master)	7s
test-annex-more	5s
test-annex (normal, macos-15)	10s
	9m 57s

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