Configure Jenkins to run Pact tests with Frontend
Configure Jenkins to run Pact tests with Frontend

Following the creation of Pact tests in #1035, we now want to run
these tests as part of the deployment pipeline.

Blocked by https://github.com/alphagov/frontend/pull/2644, which
defines the `pact:verify:branch` rake task that this calls.

alphagov/gds-api-adapters