Support auto-detecting Actions workflows #4610

Job	Run time
Diagnostic export (macos-latest, nightly-latest)	2m 4s
Diagnostic export (ubuntu-latest, linked)	1m 19s
Diagnostic export (macos-latest, linked)	1m 50s
Diagnostic export (windows-latest, linked)	3m 14s
Diagnostic export (windows-latest, nightly-latest)	3m 29s
Diagnostic export (ubuntu-latest, nightly-latest)	1m 24s
	13m 20s

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