fix ci app domain not interpolating
fix ci app domain not interpolating

this hiera is not needed as put here directly:
https://github.com/alphagov/govuk-puppet/blob/b960085464fc14beeaa87b6a8c77a18a6f3fbdb4/modules/govuk_jenkins/manifests/config.pp#L93

alphagov/govuk-puppet,alphagov/govuk-puppet,alphagov/govuk-puppet,alphagov/govuk-puppet,alphagov/govuk-puppet,alphagov/govuk-puppet