Update production storage to write to the Pure blob store

Modify the blob copying script to update the blob service name.

This completes the migration and allows us to (at some point) clean up
local disk and remove the "mirror" service from the config.

script/copy-blobs-to-pure.rb

@@ -16,7 +16,10 @@ def migrate(source_service_name, target_service_name)
     target_service = ActiveStorage::Blob.services.fetch(target_service_name)
 
     ActiveStorage::Blob.find_each do |blob|
-      if target_service.exist?(blob.key)
+      if target_service.name.to_sym == blob.service_name.to_sym
+        report[:skipped] += 1
+        putc "-"
+      elsif target_service.exist?(blob.key)
         report[:skipped] += 1
         putc "S"
       else
@@ -31,7 +34,9 @@ def migrate(source_service_name, target_service_name)
           putc "E"
         end
       end
-      # blob.update_attribute :service_name, target_service_name
+
+      # Update the service name of the blob.
+      blob.update_column :service_name, target_service_name
     end
 
     puts