Support auto-detecting Actions workflows #4618

Job	Run time
Diagnostic export (ubuntu-latest, nightly-latest)	1m 21s
Diagnostic export (macos-latest, linked)	2m 1s
Diagnostic export (windows-latest, linked)	4m 21s
Diagnostic export (windows-latest, nightly-latest)	3m 33s
Diagnostic export (macos-latest, nightly-latest)	2m 8s
Diagnostic export (ubuntu-latest, linked)	1m 19s
	14m 43s

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