Support auto-detecting Actions workflows #4617

Job	Run time
Diagnostic export (ubuntu-latest, linked)	1m 16s
Diagnostic export (windows-latest, linked)	3m 24s
Diagnostic export (ubuntu-latest, nightly-latest)	1m 19s
Diagnostic export (windows-latest, nightly-latest)	3m 35s
Diagnostic export (macos-latest, nightly-latest)	1m 30s
Diagnostic export (macos-latest, linked)	2m 19s
	13m 23s

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