Add conditional artifact upload in workflow (#278) #232

Job	Run time
sync / sync	4m 28s
check / Lint translations	54s
check / Check for zero-width space characters	1m 14s
check / Build docs (latex)	7m 44s
check / Build docs (epub)	7m 46s
check / Build docs (html)	7m 52s
check / Build docs (pdf)	0s
	29m 58s

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