Merge pull request #3009 from github/mbg/auto-detect-actions #4619

Job	Run time
Diagnostic export (macos-latest, nightly-latest)	1m 50s
Diagnostic export (windows-latest, linked)	3m 17s
Diagnostic export (ubuntu-latest, linked)	1m 17s
Diagnostic export (ubuntu-latest, nightly-latest)	1m 16s
Diagnostic export (macos-latest, linked)	2m 4s
Diagnostic export (windows-latest, nightly-latest)	3m 25s
	13m 9s

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