Basic support for overlay databases #6607

Job	Run time
Packaging: Config and input (macos-latest, nightly-latest)	2m 6s
Packaging: Config and input (macos-latest, linked)	1m 10s
Packaging: Config and input (windows-latest, default)	4m 45s
Packaging: Config and input (windows-latest, linked)	4m 48s
Packaging: Config and input (ubuntu-latest, default)	1m 8s
Packaging: Config and input (windows-latest, nightly-latest)	5m 34s
Packaging: Config and input (ubuntu-latest, nightly-latest)	1m 9s
Packaging: Config and input (ubuntu-latest, linked)	58s
Packaging: Config and input (macos-latest, default)	1m 14s
	22m 52s

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