redirect back to form if token expires

app/controllers/projects/clusters/gcp_controller.rb

@@ -7,6 +7,7 @@ class Projects::Clusters::GcpController < Projects::ApplicationController
   helper_method :valid_gcp_token
 
   def create
+    if valid_gcp_token
       @cluster = ::Clusters::CreateService
         .new(project, current_user, create_params)
         .execute(token_in_session)
@@ -19,6 +20,9 @@ class Projects::Clusters::GcpController < Projects::ApplicationController
 
         render 'projects/clusters/new', locals: { active_tab: 'gcp' }
       end
+    else
+      redirect_to new_project_cluster_path(@project)
+    end
   end
 
   private