Geo: fix a problem that prevented git cloning from secondary node

Merged Gabriel Mazetto requested to merge 1243-fix-cloning-from-geo-secondary into master

This MR prevents activity_service writing in secondary Geo (#76 (closed)) node's database. This will fix the failure users were experiencing when trying to git clone from the secondary node.

cc @marin @dewetblomerus @patricio

Closes #1243 (closed)