migrate to github actions #19

Job	Run time
Unit tests / Linux (5.9 - jammy)	3m 1s
Unit tests / Windows (${{ matrix.swift_version }} - ${{ ((contains(matrix.swift_version, 'nightly') && 'windows-2019') \|\| 'windows-2022') }})	0s
Unit tests / Linux (5.10 - jammy)	2m 54s
Unit tests / Linux (6.0 - jammy)	2m 56s
Unit tests / Linux (nightly-main - jammy)	3m 32s
Unit tests / Linux (nightly-6.0 - jammy)	3m 32s
Soundness / API breakage check	2m 59s
Soundness / Broken symlinks check	3s
Soundness / Documentation check	2m 16s
Soundness / Format check	49s
Soundness / License headers check	6s
Soundness / Python lint check	6s
Soundness / Shell check	56s
Soundness / Unacceptable language check	3s
Soundness / YAML lint check	2s
	23m 15s

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