Add GOV.UK Notify API key to email-alert-api
Add GOV.UK Notify API key to email-alert-api

This commit adds the GOV.UK Notify API key to email-alert-api and makes it available as an environment variable.

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