ci: Finish migration to Github Actions #52

Job	Run time
Integration Tests / Linux (5.8)	27s
Example Tests / Linux (5.8)	23s
Integration Tests / Linux (5.9)	37s
Example Tests / Linux (5.9)	31s
Integration Tests / Linux (5.10)	34s
Example Tests / Linux (5.10)	36s
Integration Tests / Linux (nightly-6.0)	38s
Example Tests / Linux (nightly-6.0)	38s
Integration Tests / Linux (nightly-main)	39s
Example Tests / Linux (nightly-main)	39s
Soundness / API breakage check	2m 49s
Soundness / Broken symlinks check	6s
Soundness / Documentation check	1m 48s
Soundness / Format check	41s
Soundness / License headers check	5s
Soundness / Shell check	4s
Soundness / Unacceptable language check	0s
Swift 6 Language Mode / Swift 6 language mode	48s
Cxx interop / Cxx interop / Linux (5.8)	28s
Cxx interop / Cxx interop / Linux (5.9)	1m 21s
Cxx interop / Cxx interop / Linux (5.10)	1m 15s
Cxx interop / Cxx interop / Linux (nightly-6.0)	1m 49s
Cxx interop / Cxx interop / Linux (nightly-main)	1m 43s
Unit tests / Unit tests / Linux (5.8)	25s
Unit tests / Unit tests / Linux (5.9)	1m 49s
Unit tests / Unit tests / Linux (5.10)	1m 51s
Unit tests / Unit tests / Linux (nightly-6.0)	2m 19s
Unit tests / Unit tests / Linux (nightly-main)	2m 24s
	27m 27s

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