Basic support for overlay databases #3472

Job	Run time
Resolve environment (ubuntu-latest, default)	34s
Resolve environment (ubuntu-latest, linked)	33s
Resolve environment (windows-latest, default)	3m 39s
Resolve environment (ubuntu-latest, nightly-latest)	33s
Resolve environment (windows-latest, nightly-latest)	2m 25s
Resolve environment (macos-latest, nightly-latest)	1m 59s
Resolve environment (macos-latest, default)	2m 54s
Resolve environment (windows-latest, linked)	3m 37s
Resolve environment (macos-latest, linked)	2m 32s
	18m 46s

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