Setting up a new environment

WIP!

Decide on a name.
Make a new AWS account.
Set up account links between new account and master account.
- http://cobus.io/aws/2016/09/03/AWS_Multi_Account.html
- Set up role assumption, consolidated billing.
[SUB] Set up access credentials in local AWS profile.
[SUB] Allow access to cgn-terraform S3 bucket.
[MASTER] Allow CircleCI user to access cgn-YOUR-ENV-ci and cgn-YOUR-ENV-static S3 buckets.
[SUB] Set up AWS credentials.
[SUB] Set up an SSH key and make available locally for SSH usage.
[MASTER] Register a domain with AWS Route53.
[SUB] Set up hosted zone for domain.
[SUB] Register SSL certificate with AWS ACM.
Clone _staging and edit all occurrences of staging to your new name.
Edit your new environment to suit.
cd _YOUR-ENV && make remote to bootstrap Terraform state.

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