Add Rake task to backfill local-only flag (#253)

lib/tasks/glitchsoc.rake

@@ -0,0 +1,8 @@
+namespace :glitchsoc do
+  desc 'Backfill local-only flag on statuses table'
+  task backfill_local_only: :environment do
+    Status.local.where(local_only: nil).find_each do |st|
+      ActiveRecord::Base.logger.silence { st.update_attribute(:local_only, st.marked_local_only?) }
+    end
+  end
+end