Remove tempfile created by minimagick.

app/controllers/announcements_controller.rb

@@ -760,6 +760,7 @@ class AnnouncementsController < ApplicationController
         if image[:height]
           metas << {"property" => "og:image:height", "content" => image[:height].to_s}
         end
+        image.destroy! # Remove the tempfile
       end
     end
     OrbitHelper.render_meta_tags(metas)

app/models/bulletin.rb

@@ -416,6 +416,7 @@ class Bulletin
       if image
         a["image"]["width"] = image[:width]
         a["image"]["height"] = image[:height]
+        image.destroy! # Remove the tempfile
       end
     end
     a["tags"] = []