Enable redis-based caching in production

Setting some pretty low-timeouts by default

config/environments/production.rb

@@ -51,6 +51,17 @@
   # Use a different cache store in production.
   # config.cache_store = :mem_cache_store
 
+  redis_url = ENV["CACHE_REDIS_URL"].presence || ENV["REDIS_URL"]
+  if redis_url.present?
+    config.cache_store = :redis_cache_store, {
+      url: redis_url,
+      connect_timeout:    1,
+      read_timeout:       0.2,
+      write_timeout:      0.2,
+      reconnect_attempts: 1,
+    }
+  end
+
   # Use a real queuing backend for Active Job (and separate queues per environment).
   # config.active_job.queue_adapter     = :resque
   # config.active_job.queue_name_prefix = "resumis_production"

config/initializers/sidekiq.rb

@@ -1,4 +1,4 @@
-redis_url = ENV['REDIS_URL'].presence || 'redis://localhost:6379/1'
+redis_url = ENV["SIDEKIQ_REDIS_URL"].presence || ENV["REDIS_URL"].presence || 'redis://localhost:6379/1'
 Sidekiq.configure_server do |config|
   config.redis = { url: redis_url }
 end