migrate to github actions #4

Job	Run time
Unit tests / Unit tests / Linux (5.9)	11m 21s
Unit tests / Unit tests / Linux (5.10)	11m 26s
Unit tests / Unit tests / Linux (6.0)	12m 29s
Unit tests / Unit tests / Linux (nightly-6.0)	13m 29s
Unit tests / Unit tests / Linux (nightly-main)	12m 55s
Unit tests / Unit tests / Windows (6.0)	3s
Unit tests / Unit tests / Windows (nightly-6.0)	1s
Unit tests / Unit tests / Windows (nightly-main)	1s
Soundness / Documentation check	2m 1s
Soundness / API breakage check	2m 40s
Soundness / Broken symlinks check	3s
Soundness / License headers check	3s
Soundness / Unacceptable language check	2s
Soundness / Format check	33s
Soundness / Python lint check	6s
Soundness / Shell check	32s
Soundness / YAML lint check	6s
	1h 7m 51s

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