Switch Docker registry back to the original one
Switch Docker registry back to the original one

... which is `registry.service.dsd.io`.

We need to do this as our deployment process does not currently
handle other Docker registries.

ministryofjustice/cla_public,ministryofjustice/cla_public,ministryofjustice/cla_public,ministryofjustice/cla_public