Add support for GitHub Actions #3

Job	Run time
Test / macOS (Xcode 16.3 - sequoia - ARM64)	1h 0m 32s
Test / Linux (nightly-main - jammy - aarch64)	5m 24s
Test / macOS (Xcode 16.4 - sequoia - ARM64)	1h 2m 13s
Test / Linux (nightly-main - jammy - x86_64)	6m 4s
Test / macOS (Xcode 26.0 - sequoia - ARM64)	1h 0m 28s
Test / Linux (nightly-6.3 - jammy - x86_64)	6m 27s
Test / Linux (nightly-6.3 - jammy - aarch64)	5m 39s
Test / Windows (nightly-6.3 - windows-2022)	17m 29s
Test / Windows (nightly-main - windows-2022)	7m 27s
Soundness / Unacceptable language check	6s
Soundness / Documentation check	2m 8s
Soundness / Format check	46s
Soundness / API breakage check	4m 39s
Soundness / Broken symlinks check	7s
Soundness / Shell check	22s
Soundness / YAML lint check	7s
Soundness / Python lint check	9s
Soundness / License headers check	15s
	4h 0m 22s

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