DNM: ci: Use workflow from swiftlang/github-workflows for soundness checks #90

Job	Run time
Compatibility test	5m 7s
Swift 6 Language Mode	0s
Integration test / Linux (5.8)	23s
Example packages / Linux (5.8)	23s
Integration test / Linux (5.9)	1m 47s
Example packages / Linux (5.9)	16m 13s
Integration test / Linux (5.10)	1m 31s
Example packages / Linux (5.10)	14m 59s
Soundness / API breakage check	2m 17s
Integration test / Linux (nightly-6.0)	2m 14s
Example packages / Linux (nightly-6.0)	22m 28s
Integration test / Linux (nightly-main)	31s
Example packages / Linux (nightly-main)	29s
Soundness / Broken symlinks check	5s
Soundness / Documentation check	1m 40s
Soundness / Format check	45s
Soundness / License headers check	6s
Soundness / Shell check	38s
Soundness / Unacceptable language check	2s
Unit tests / Unit tests / Linux (5.8)	25s
Unit tests / Unit tests / Linux (5.9)	1m 37s
Unit tests / Unit tests / Linux (5.10)	1m 49s
Unit tests / Unit tests / Linux (nightly-6.0)	2m 11s
Unit tests / Unit tests / Linux (nightly-main)	27s
	1h 18m 7s

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