Support requesting latest nightly with `tools: nightly` #5144

Job	Run time
Config export (macos-latest, linked)	1m 28s
Config export (windows-latest, linked)	1m 56s
Config export (ubuntu-latest, linked)	1m 8s
Config export (windows-latest, nightly-latest)	2m 34s
Config export (macos-latest, nightly-latest)	1m 25s
Config export (ubuntu-latest, nightly-latest)	1m 4s
	9m 35s

Provide feedback