Migrate CI to use GitHub Actions. #7

Job	Run time
Swift 6 Language Mode	0s
Soundness / Broken symlinks check	8s
Soundness / API breakage check	2m 17s
Soundness / Format check	34s
Soundness / Documentation check	1m 45s
Soundness / License headers check	5s
Soundness / Shell check	32s
Soundness / Unacceptable language check	2s
Soundness / Python lint check	4s
Soundness / YAML lint check	3s
Cxx interop / Cxx interop / Linux (5.9)	1m 25s
Cxx interop / Cxx interop / Linux (5.10)	1m 25s
Cxx interop / Cxx interop / Windows (6.0)	3s
Cxx interop / Cxx interop / Linux (6.0)	1m 25s
Cxx interop / Cxx interop / Windows (nightly-6.0)	2s
Cxx interop / Cxx interop / Linux (nightly-6.0)	1m 42s
Cxx interop / Cxx interop / Windows (nightly-main)	3s
Cxx interop / Cxx interop / Linux (nightly-main)	1m 54s
Unit tests / Unit tests / Windows (6.0)	1s
Unit tests / Unit tests / Linux (5.9)	2m 19s
Unit tests / Unit tests / Windows (nightly-6.0)	1s
Unit tests / Unit tests / Linux (5.10)	2m 25s
Unit tests / Unit tests / Windows (nightly-main)	1s
Unit tests / Unit tests / Linux (6.0)	1m 35s
Unit tests / Unit tests / Linux (nightly-6.0)	2m 20s
Unit tests / Unit tests / Linux (nightly-main)	2m 20s
	24m 31s

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