Add staging-deploy to CircleCI
Add staging-deploy to CircleCI

Mostly copied from laa-fee-calculator project.

Using kubectl commands to deploy into staging environemnt before
helm because it's quicker to implement. The intention is to use Helm in the future.

ministryofjustice/cla_public,ministryofjustice/cla_public,ministryofjustice/cla_public,ministryofjustice/cla_public