update rake task to add participants in admin_sets

hyrax/lib/tasks/default_admin_set_for_workflow.rake

@@ -23,6 +23,12 @@ namespace :hyrax do
             mediated_workflow = admin_set.permission_template.available_workflows.where(name: workflow_name).first
 
             Sipity::Workflow.activate!(permission_template: admin_set.permission_template, workflow_id: mediated_workflow.id)
+
+            # update Participants
+
+            access_grants_params = {access_grants_attributes:{'0'=> {agent_type: "group", agent_id: "publication_manager", access:"manage"}}}
+            permission_template_form =  Hyrax::Forms::PermissionTemplateForm.new(admin_set.permission_template)
+            permission_template_form.update(access_grants_params)
           end
         end
       else