Add sidekiq gem

Gemfile

@@ -84,6 +84,7 @@ gem 'roadie-rails', '~> 2.2.0'
 
 gem 'redis', '>= 4.0', require: ['redis', 'redis/connection/hiredis']
 gem 'hiredis'
+gem 'sidekiq'
 
 gem 'combine_pdf'
 gem 'wicked_pdf'

Gemfile.lock

@@ -186,6 +186,7 @@ GEM
       sass-rails (< 5.1)
       sprockets (< 4.0)
     concurrent-ruby (1.1.8)
+    connection_pool (2.2.5)
     crack (0.4.5)
       rexml
     crass (1.0.6)
@@ -542,6 +543,10 @@ GEM
       rubyzip (>= 1.2.2)
     shoulda-matchers (4.5.1)
       activesupport (>= 4.2.0)
+    sidekiq (6.2.1)
+      connection_pool (>= 2.2.2)
+      rack (~> 2.0)
+      redis (>= 4.2.0)
     simplecov (0.21.2)
       docile (~> 1.1)
       simplecov-html (~> 0.11)
@@ -730,6 +735,7 @@ DEPENDENCIES
   select2-rails (~> 3.4.7)
   selenium-webdriver
   shoulda-matchers
+  sidekiq
   simplecov
   spring
   spring-commands-rspec