Support requesting latest nightly with `tools: nightly` #5137

Job	Run time
Config export (windows-latest, nightly-latest)	3m 12s
Config export (windows-latest, linked)	2m 48s
Config export (macos-latest, linked)	1m 7s
Config export (ubuntu-latest, nightly-latest)	1m 5s
Config export (macos-latest, nightly-latest)	1m 50s
Config export (ubuntu-latest, linked)	1m 11s
	11m 13s

Provide feedback