Set SWHPKGDIR on the main sphinx job as well
this is needed for the apidoc stuff to work properly
Test Plan
tox -e sphinx
Migrated from D3090 (view on Phabricator)
Staging instance, all changes can be removed at any time
this is needed for the apidoc stuff to work properly
tox -e sphinx
Migrated from D3090 (view on Phabricator)