DR: get rid of `geo_postgresql['enable'] = true` step
Almost at the end of the DR setup, we are being asked to add
geo_postgresql['enable'] = true to gitlab.rb (documentation).
Having to update gitlab.rb at this stage feels like a why should I modify this file again??.
Can we add this line at the stage where we already add
geo_secondary_role['enable'] = true on the secondary (documentation).