Add GitHub action that automatically creates a PR to merge main into a release branch #137

Job	Run time
Test without Docker / Linux (${{ matrix.swift_version }} - ${{ matrix.os_version }})	0s
Test with Docker / Windows (5.9 - windows-2022)	16m 34s
Test with Docker / Linux (5.9 - jammy)	27s
Test without Docker / Windows (5.9 - windows-2022)	5m 39s
Test with Docker / Windows (6.0 - windows-2022)	16m 30s
Test with Docker / Linux (5.10 - jammy)	27s
Test without Docker / Windows (6.0 - windows-2022)	4m 35s
Test with Docker / Windows (6.1 - windows-2022)	18m 7s
Test with Docker / Linux (6.0 - jammy)	32s
Test without Docker / Windows (6.1 - windows-2022)	4m 35s
Test with Docker / Windows (nightly - windows-2019)	9m 39s
Test with Docker / Linux (6.1 - jammy)	32s
Test without Docker / Windows (nightly - windows-2022)	4m 43s
Test with Docker / Windows (nightly-6.1 - windows-2019)	8m 33s
Test with Docker / Linux (nightly-main - jammy)	36s
Test without Docker / Windows (nightly-6.1 - windows-2022)	5m 40s
Test with Docker / Linux (nightly-6.1 - jammy)	36s
Soundness / Unacceptable language check	2s
Soundness / API breakage check	0s
Soundness / Documentation check	34s
Soundness / Broken symlinks check	3s
Soundness / License headers check	3s
Soundness / Shell check	36s
Soundness / YAML lint check	2s
Soundness / Python lint check	7s
Soundness / Format check	0s
	1h 39m 12s

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