Build git-annex on macOS ARM64 #130

Job	Run time
build-package	8m 2s
test-annex-more	20s
test-datalad (release)	1h 44m 16s
test-datalad (maint)	1h 47m 8s
test-annex (crippled-tmp, macos-15)	7m 43s
test-datalad (master)	1h 43m 47s
test-annex (normal, macos-15)	4m 27s
test-annex (custom-config1, macos-15)	4m 40s
test-annex (normal, macos-latest)	6m 23s
	5h 46m 46s

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