Add CI runners registration token reset button

app/controllers/admin/application_settings_controller.rb

@@ -13,6 +13,12 @@ class Admin::ApplicationSettingsController < Admin::ApplicationController
     end
   end
 
+  def reset_runners_token
+    @application_setting.reset_runners_registration_token!
+    flash[:notice] = 'New runners registration token has been generated!'
+    redirect_to ci_admin_runners_path
+  end
+
   private
 
   def set_application_setting

app/views/ci/admin/runners/index.html.haml

@@ -3,7 +3,18 @@
     To register a new runner you should enter the following registration token.
     With this token the runner will request a unique runner token and use that for future communication.
     Registration token is
-    %code #{current_application_settings.runners_registration_token}
+    %code{ id: 'runners-token' } #{current_application_settings.runners_registration_token}
+
+.bs-callout.clearfix
+  .pull-left
+    %p
+      You can reset runners registration token by pressing a button below.
+    %p
+      = button_to reset_runners_token_admin_application_settings_path,
+        method: :put, class: 'btn btn-default',
+        data: { confirm: 'Are you sure you want to reset registration token?' } do
+        = icon('refresh')
+        Reset runners registration token
 
 .bs-callout
   %p

config/routes.rb

@@ -276,6 +276,7 @@ Rails.application.routes.draw do
 
     resource :application_settings, only: [:show, :update] do
       resources :services
+      put :reset_runners_token
     end
 
     resources :labels