MacOSX build/release workflow

Merge pull request #86 from cloudflare/github-actions-osx #5

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Run time

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Job	Run time
Build wheel on macos-11	1h 30m 59s
Build wheel on macos-12	2h 0m 53s
Build wheel on macos-13	1h 1m 40s
	4h 33m 32s