Build flat package for macOS #192

Job	Run time
Build wheel and source distribution	22s
aarch64-unknown-linux-gnu (ubuntu-22.04)	5m 46s
x86_64-unknown-linux-gnu (ubuntu-22.04)	5m 22s
x86_64-unknown-linux-musl (ubuntu-22.04)	7m 3s
i686-unknown-linux-gnu (ubuntu-22.04)	5m 38s
powerpc64le-unknown-linux-gnu (ubuntu-22.04)	5m 41s
x86_64-pc-windows-msvc (windows-2022)	9m 9s
i686-pc-windows-msvc (windows-2022)	8m 38s
aarch64-apple-darwin (macos-12)	4m 12s
x86_64-apple-darwin (macos-12)	6m 40s
Build Windows installers	1m 21s
Build macOS installer and sign/notarize artifacts	1m 3s
Publish release	0s
	1h 0m 55s

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