Allow omitting the autobuild Action when build mode specified #1580

Job	Run time
Diagnostic export (ubuntu-latest, stable-20230317)	1m 33s
Diagnostic export (macos-latest, stable-20230317)	3m 33s
Diagnostic export (windows-latest, stable-20230317)	9m 21s
Diagnostic export (ubuntu-latest, latest)	1m 35s
Diagnostic export (macos-latest, latest)	3m 20s
Diagnostic export (windows-latest, latest)	5m 59s
Diagnostic export (ubuntu-latest, nightly-latest)	2m 45s
Diagnostic export (macos-latest, nightly-latest)	2m 56s
Diagnostic export (windows-latest, nightly-latest)	3m 44s
	34m 46s

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