Enable macOS CI on pull requests #57

Job	Run time
Cxx interop / Construct Cxx interop matrix	3s
macOS tests / Construct Darwin matrix	3s
Unit tests / Construct unit test matrix	2s
Soundness / Broken symlinks check	5s
Soundness / API breakage check	44s
Soundness / Documentation check	1m 4s
Soundness / Format check	32s
Soundness / License headers check	3s
Soundness / Python lint check	4s
Soundness / Shell check	31s
Soundness / Unacceptable language check	3s
Soundness / YAML lint check	4s
macOS tests / Xcode 16.0	4m 43s
macOS tests / Xcode 16.1	5m 17s
Cxx interop / Cxx interop / Linux (5.9)	40s
macOS tests / Xcode 16.2	6m 43s
Unit tests / Unit tests / Linux (5.9)	34s
Cxx interop / Cxx interop / Linux (5.10)	41s
Unit tests / Unit tests / Linux (5.10)	36s
Unit tests / Unit tests / Linux (6.0)	43s
Cxx interop / Cxx interop / Linux (6.0)	44s
Unit tests / Unit tests / Linux (nightly-next)	47s
Cxx interop / Cxx interop / Linux (nightly-next)	50s
Unit tests / Unit tests / Linux (nightly-main)	54s
Cxx interop / Cxx interop / Linux (nightly-main)	55s
	27m 25s

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