Handle GET /tasks/:id/runs

Since a validation error results in the URL being shown in the address
bar, it's a good practice to support the URL for GET requests. We just
redirect back to the task page.

Co-authored-by: Derek Meulmeester <[email protected]>

config/routes.rb

@@ -9,6 +9,7 @@
         put "resume"
       end
     end
+    get :runs, to: redirect("tasks/%{task_id}")
   end
 
   root to: "tasks#index"