ci: Finish migration to Github Actions #36

Job	Run time
Soundness / Broken symlinks check	2s
Soundness / API breakage check	2m 54s
Checks / Integration Tests / 5.8	26s
Soundness / Documentation check	28s
Checks / Integration Tests / 5.9	42s
Checks / Integration Tests / 5.10	39s
Soundness / License headers check	5s
Soundness / Format check	41s
Checks / Integration Tests / nightly-6.0	50s
Soundness / Unacceptable language check	0s
Checks / Integration Tests / nightly-main	42s
Checks / Example Tests / 5.8	32s
Checks / Cxx interop / 5.8	25s
Checks / Example Tests / 5.9	33s
Checks / Cxx interop / 5.9	1m 20s
Checks / Example Tests / 5.10	35s
Checks / Cxx interop / 5.10	1m 23s
Checks / Example Tests / nightly-6.0	46s
Checks / Cxx interop / nightly-6.0	1m 51s
Checks / Example Tests / nightly-main	38s
Checks / Cxx interop / nightly-main	1m 46s
Checks / Unit tests / 5.8	25s
Checks / Unit tests / 5.9	1m 46s
Checks / Unit tests / 5.10	1m 41s
Checks / Unit tests / nightly-6.0	2m 39s
Checks / Unit tests / nightly-main	2m 31s
	26m 20s

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