do not try to schedule jobs during asset precompilation

config/initializers/shrine.rb

@@ -11,12 +11,15 @@
     nil # migrations probably haven't run yet to create library table
   end
 
-  begin
-    Sidekiq::Cron::Job.create(
-      name: "clear-shrine-cache",
-      cron: "every hour",
-      class: "CacheSweepJob"
-    )
-  rescue RedisClient::CannotConnectError
+  unless ENV.fetch("PREPARE_APP", nil)
+    begin
+      Sidekiq::Cron::Job.create(
+        name: "clear-shrine-cache",
+        cron: "every hour",
+        class: "CacheSweepJob"
+      )
+    rescue
+      RedisClient::CannotConnectError
+    end
   end
 end

config/initializers/usage_reports.rb

@@ -2,6 +2,6 @@
 
 Rails.application.config.after_initialize do
   # Make sure the schedule is loaded correctly
-  UsageReport.set_schedule!
+  UsageReport.set_schedule! unless ENV.fetch("PREPARE_APP", nil)
 rescue RedisClient::CannotConnectError
 end

docker/build.dockerfile

@@ -27,4 +27,5 @@ RUN \
   DATABASE_URL="nulldb://user:pass@localhost/db" \
   SECRET_KEY_BASE="placeholder" \
   RACK_ENV="production" \
+  PREPARE_APP="true" \
   bundle exec rake assets:precompile