Migrate to GitHub Actions #6

Job	Run time
Swift 6 Language Mode	0s
Soundness / API breakage check	3m 1s
Integration test / Windows (nightly-6.0)	1s
Integration test / Windows (6.0)	3s
Integration test / Linux (5.9)	5m 2s
Integration test / Windows (nightly-main)	3s
Integration test / Linux (5.10)	5m 9s
Soundness / Broken symlinks check	6s
Integration test / Linux (6.0)	5m 33s
Soundness / Documentation check	1m 59s
Soundness / Format check	37s
Integration test / Linux (nightly-6.0)	6m 54s
Soundness / License headers check	4s
Soundness / Python lint check	10s
Soundness / Shell check	40s
Integration test / Linux (nightly-main)	7m 10s
Soundness / YAML lint check	8s
Soundness / Unacceptable language check	5s
Cxx interop / Cxx interop / Windows (6.0)	2s
Cxx interop / Cxx interop / Windows (nightly-6.0)	1s
Cxx interop / Cxx interop / Linux (5.9)	1m 39s
Cxx interop / Cxx interop / Windows (nightly-main)	3s
Cxx interop / Cxx interop / Linux (5.10)	1m 46s
Cxx interop / Cxx interop / Linux (6.0)	1m 54s
Cxx interop / Cxx interop / Linux (nightly-6.0)	2m 16s
Cxx interop / Cxx interop / Linux (nightly-main)	2m 18s
Unit tests / Unit tests / Linux (5.9)	2m 2s
Unit tests / Unit tests / Windows (6.0)	1s
Unit tests / Unit tests / Linux (5.10)	2m 10s
Unit tests / Unit tests / Linux (6.0)	2m 12s
Unit tests / Unit tests / Windows (nightly-6.0)	2s
Unit tests / Unit tests / Linux (nightly-6.0)	2m 40s
Unit tests / Unit tests / Windows (nightly-main)	2s
Unit tests / Unit tests / Linux (nightly-main)	2m 48s
	58m 41s

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