Add rake task for manually running submissions in queue.

lib/tasks/run_submissions_in_queue.rake

@@ -0,0 +1,14 @@
+desc "Run all submission with status 'In Queue'."
+
+namespace :judge0 do
+  task :run_in_queue => :environment do
+    ARGV.each { |a| task a.to_sym do ; end }
+    Submission.where(status_id: Status.queue).each do |s|
+      if ARGV[1].to_s == "now"
+        IsolateJob.perform_now(s)
+      else
+        IsolateJob.perform_later(s)
+      end
+    end
+  end
+end