don't store generated exports fields on github #1412

Job	Run time
list-branches	9s
Build for data-view-clamped-stage-2	8s
Build for proposals-types	7s
Build for v3	10s
Build for json-source-stable	6s
Build for v4-types	6s
Build for v4	6s
Build for web	5s
Build for master	8s
combine-pages-and-deploy	19s
	1m 24s

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