Support requesting latest nightly with `tools: nightly` #4662

Job	Run time
Resolve environment (ubuntu-latest, linked)	33s
Resolve environment (macos-latest, default)	2m 8s
Resolve environment (ubuntu-latest, default)	45s
Resolve environment (windows-latest, nightly-latest)	2m 2s
Resolve environment (macos-latest, nightly-latest)	1m 51s
Resolve environment (windows-latest, default)	2m 35s
Resolve environment (ubuntu-latest, nightly-latest)	32s
Resolve environment (macos-latest, linked)	2m 4s
Resolve environment (windows-latest, linked)	1m 25s
	13m 55s

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