administrator dashboard for observing the Docker container pool

app/helpers/admin/dashboard_helper.rb

@@ -0,0 +1,13 @@
+module Admin
+  module DashboardHelper
+    def dashboard_data
+      {docker: docker_data}
+    end
+
+    def docker_data
+      ExecutionEnvironment.order(:id).select(:id, :permitted_execution_time, :pool_size).map do |execution_environment|
+        execution_environment.attributes.merge(quantity: DockerContainerPool.quantities[execution_environment.id])
+      end
+    end
+  end
+end