Support requesting latest nightly with `tools: nightly` #5737

Job	Run time
Ruby analysis (ubuntu-latest, default)	46s
Ruby analysis (ubuntu-latest, linked)	45s
Ruby analysis (macos-latest, linked)	1m 15s
Ruby analysis (macos-latest, nightly-latest)	1m 7s
Ruby analysis (macos-latest, default)	1m 22s
Ruby analysis (ubuntu-latest, nightly-latest)	48s
	6m 3s

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