ci: Finish migration to Github Actions #49

Job	Run time
Checks / Integration Tests / Linux (5.8)	27s
Checks / Integration Tests / Linux (5.9)	34s
Checks / Integration Tests / Linux (5.10)	33s
Checks / Example Tests / Linux (5.8)	27s
Checks / Integration Tests / Linux (nightly-6.0)	43s
Soundness / Broken symlinks check	3s
Checks / Example Tests / Linux (5.9)	31s
Checks / Integration Tests / Linux (nightly-main)	44s
Soundness / API breakage check	2m 58s
Checks / Example Tests / Linux (5.10)	29s
Checks / Example Tests / Linux (nightly-6.0)	44s
Soundness / Documentation check	1m 48s
Checks / Example Tests / Linux (nightly-main)	39s
Soundness / Format check	42s
Soundness / License headers check	5s
Soundness / Shell check	6s
Soundness / Unacceptable language check	0s
Checks / Cxx interop / Linux (5.8)	26s
Checks / Cxx interop / Linux (5.9)	1m 18s
Checks / Unit tests / Linux (5.8)	27s
Checks / Cxx interop / Linux (5.10)	1m 16s
Checks / Unit tests / Linux (5.9)	1m 37s
Checks / Cxx interop / Linux (nightly-6.0)	1m 39s
Checks / Unit tests / Linux (5.10)	1m 40s
Checks / Cxx interop / Linux (nightly-main)	1m 44s
Checks / Unit tests / Linux (nightly-6.0)	2m 19s
Checks / Unit tests / Linux (nightly-main)	2m 22s
	26m 21s

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