move use of input variables into env vars #4058

Job	Run time
Diagnostic export (macos-latest, linked)	59s
Diagnostic export (ubuntu-latest, nightly-latest)	1m 5s
Diagnostic export (ubuntu-latest, linked)	1m 8s
Diagnostic export (windows-latest, nightly-latest)	7m 23s
Diagnostic export (macos-latest, nightly-latest)	59s
Diagnostic export (windows-latest, linked)	6m 9s
	17m 43s

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