Build git-annex on macOS ARM64 #128

Job	Run time
build-package	10m 18s
test-annex-more	21s
test-datalad (release)	1h 42m 41s
test-datalad (master)	1h 45m 13s
test-datalad (maint)	1h 39m 36s
test-annex (crippled-tmp, macos-15)	6m 48s
test-annex (custom-config1, macos-15)	4m 30s
test-annex (normal, macos-15)	5m 19s
test-annex (normal, macos-latest)	5m 57s
	5h 40m 43s

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