Reduce sidekiq worker thread count
Reduce sidekiq worker thread count

10 was much too high a database load as it was
slowing down the processing jobs to about 10
minutes each and also causing increases in
deadlocks.

theodi/open-data-certificate,Motejl/open-data-certificate,zoul/open-data-certificate,Motejl/open-data-certificate,zoul/open-data-certificate,ahmadassaf/open-data-certificate,zoul/open-data-certificate,Motejl/open-data-certificate,theodi/open-data-certificate,ahmadassaf/open-data-certificate,theodi/open-data-certificate,zoul/open-data-certificate,ahmadassaf/open-data-certificate,ahmadassaf/open-data-certificate,theodi/open-data-certificate,Motejl/open-data-certificate