My Crossref running on production infra

This milestone covers the development of the configuration and deployment features within the MyCrossref Frontend Application.

User Stories

As the Crossref development team, I want to apply different configuration values to MyCrossref, when I deploy to a particular environment, so that I can change the application's behaviour to suit the environment.
As the Product team, I want MyCrossref to be hosted under a staging url, so that I can acceptance test new features
As a Crossref member, I want MyCrossref to be hosted under a sandbox url, so that I can test my integrations against it
As a Crossref member, I want MyCrossref to be hosted under a production url, so that I can use it
As the Crossref development team, I want to apply sanity tests to configuration parameters, so that they do not break the application
As the Crossref member, I want to new versions of the app to be available quickly, so that I can make use of the new features

Applying environmental configuration
- Given that specific parameters for a named environment are defined for MyCrossref
- When the application is deployed into that environment
- Then the configuration parameters exist in the application
Hosting MyCrossref under a staging URL
- Given that new features are ready for testing
- When MyCrossref is deployed
- Then I can access the features via the staging URL
Hosting MyCrossref under a sandbox URL
- Given there is a new version of MyCrossref
- When MyCrossref is deployed
- Then I can access the new version via the sandbox URL
Hosting MyCrossref under a production URL
- Given there is a new version of MyCrossref
- When MyCrossref is deployed
- Then I can access the new version via the production URL
Apply sanity checks to configuration parameters
- Given that there are updated configuration parameters
- When MyCrossref is deployed
- Then those parameters are tested for sanity
New versions are available quickly
- Given there is a new version of MyCrossref
- When MyCrossref is deployed
- Then I can access the new version via the production URL without a long delay

In the context of this feature when we talk about applying configuration to the application, we mean applying parameters that will be pulled in via the webpack build process, and available within the Typescript code.