Create event and clear cache on new trag push

Signed-off-by: Dmitriy Zaporozhets <dmitriy.zaporozhets@gmail.com>

app/services/git_tag_push_service.rb

 class GitTagPushService
   attr_accessor :project, :user, :push_data
+
   def execute(project, user, oldrev, newrev, ref)
     @project, @user = project, user
     @push_data = create_push_data(oldrev, newrev, ref)
+
+    create_push_event
+    project.repository.expire_cache
     project.execute_hooks(@push_data.dup, :tag_push_hooks)
   end
 
@@ -24,4 +28,13 @@ class GitTagPushService
       }
     }
   end
+
+  def create_push_event
+    Event.create!(
+      project: project,
+      action: Event::PUSHED,
+      data: push_data,
+      author_id: push_data[:user_id]
+    )
+  end
 end