Published docker image

[mikemonteith]

Publish an official sandbox docker image

The Record A Vaccination Service (RAVS) uses the PDS API.
Developers are using the hosted sandbox in local development, and in automated tests.
It would be nice if we could host our own instance of the sandbox locally so that our automated tests are insulated from external issues (network issues, the hosted sandbox going down, changes to the sandbox etc.) which can result in flaky tests.

To solve this, our team could clone this repo and create our own docker image to be run during tests - but it would make more sense if the PDS API team owned the docker image.

Mocks for other NHS sandbox APIs would also be useful

Questions:

1. Is there a public docker registry that is already in use by NHS Digital, where the image could be published?