Basic support for overlay databases #4541

Job	Run time
Ruby analysis (macos-latest, nightly-latest)	1m 36s
Ruby analysis (macos-latest, linked)	1m 17s
Ruby analysis (ubuntu-latest, linked)	45s
Ruby analysis (ubuntu-latest, default)	47s
Ruby analysis (macos-latest, default)	57s
Ruby analysis (ubuntu-latest, nightly-latest)	46s
	6m 8s

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