Provision the new postgres router/router-api apps in govuk-docker

[catalinailie]

Get the new Router/Router API applications running in govuk-docker. This will allow us to develop the new applications locally.

Trello card: https://trello.com/c/nQcpWnD5/1788-provision-new-apps-in-govuk-docker-for-prouter-and-prouter-api