Basic support for overlay databases #4542

Job	Run time
Ruby analysis (ubuntu-latest, linked)	54s
Ruby analysis (macos-latest, nightly-latest)	59s
Ruby analysis (macos-latest, linked)	1m 3s
Ruby analysis (macos-latest, default)	1m 16s
Ruby analysis (ubuntu-latest, nightly-latest)	45s
Ruby analysis (ubuntu-latest, default)	46s
	5m 43s

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