Execute services for tag push.

app/services/git_tag_push_service.rb

@@ -8,6 +8,7 @@ class GitTagPushService
     EventCreateService.new.push(project, user, @push_data)
     project.repository.expire_cache
     project.execute_hooks(@push_data.dup, :tag_push_hooks)
+    project.execute_services(@push_data.dup, :tag_push_hooks)
 
     if project.gitlab_ci?
       project.gitlab_ci_service.async_execute(@push_data)