Migrate to GitHub Actions #3

Job	Run time
Soundness / API breakage check	53s
Soundness / Broken symlinks check	4s
Soundness / Format check	32s
Soundness / Documentation check	1m 2s
Soundness / License headers check	5s
Soundness / Shell check	32s
Soundness / Unacceptable language check	5s
Soundness / Python lint check	7s
Soundness / YAML lint check	3s
Cxx interop / Cxx interop / Linux (5.9)	45s
Cxx interop / Cxx interop / Windows (6.0)	8s
Cxx interop / Cxx interop / Linux (5.10)	47s
Cxx interop / Cxx interop / Linux (6.0)	49s
Cxx interop / Cxx interop / Windows (nightly-6.0)	3s
Cxx interop / Cxx interop / Linux (nightly-6.0)	50s
Cxx interop / Cxx interop / Windows (nightly-main)	1s
Cxx interop / Cxx interop / Linux (nightly-main)	52s
Unit tests / Unit tests / Linux (5.9)	42s
Unit tests / Unit tests / Windows (nightly-6.0)	2s
Unit tests / Unit tests / Linux (5.10)	47s
Unit tests / Unit tests / Windows (nightly-main)	1s
Unit tests / Unit tests / Linux (6.0)	44s
Unit tests / Unit tests / Linux (nightly-6.0)	54s
Unit tests / Unit tests / Windows (6.0)	2s
Unit tests / Unit tests / Linux (nightly-main)	54s
	11m 44s

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