Support auto-detecting Actions workflows #4612

Job	Run time
Diagnostic export (ubuntu-latest, linked)	1m 17s
Diagnostic export (macos-latest, linked)	1m 23s
Diagnostic export (windows-latest, linked)	3m 19s
Diagnostic export (ubuntu-latest, nightly-latest)	1m 26s
Diagnostic export (windows-latest, nightly-latest)	2m 59s
Diagnostic export (macos-latest, nightly-latest)	1m 30s
	11m 54s

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