migrate to github actions #18

Job	Run time
Unit tests / Linux (5.9 - jammy)	11m 16s
Unit tests / Windows (${{ matrix.swift_version }} - ${{ ((contains(matrix.swift_version, 'nightly') && 'windows-2019') \|\| 'windows-2022') }})	0s
Unit tests / Linux (5.10 - jammy)	11m 21s
Unit tests / Linux (6.0 - jammy)	12m 29s
Unit tests / Linux (nightly-main - jammy)	13m 14s
Unit tests / Linux (nightly-6.0 - jammy)	13m 12s
Soundness / API breakage check	2m 38s
Soundness / Documentation check	1m 55s
Soundness / License headers check	3s
Soundness / Unacceptable language check	7s
Soundness / Broken symlinks check	8s
Soundness / Format check	35s
Soundness / Python lint check	5s
Soundness / Shell check	37s
Soundness / YAML lint check	3s
	1h 7m 43s

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