Test

CI: Migrate to GitHub Actions #6

Job	Run time
ruby-versions / Generate Ruby versions	3s
macos-latest 3.0	15s
macos-latest 3.1	11s
ubuntu-latest 3.0	9s
macos-latest 3.3	8s
macos-latest 3.4	12s
ubuntu-latest 3.1	7s
ubuntu-latest 2.7	27s
macos-latest 2.7	40s
ubuntu-latest 3.2	13s
ubuntu-latest 3.3	12s
ubuntu-latest 3.4	9s
ubuntu-latest 4.0	9s
ubuntu-latest head	12s
macos-latest 3.2	13s
macos-latest head	12s
macos-latest 4.0	12s
	3m 44s

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