feat: add terraform infra as code for AWS fargate (#1987)

terraform/README.md

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+# Terraform for AWS Fargate
+
+Here's some configurable terraform to get you up and running with the streetmerchant docker image in AWS ECS Fargate.
+
+Running on cloud infrastructure, your mileage may vary, and you'll need to integrate with one of the chat notifications rather than having your local browser navigate to a url for you.
+
+The author's findings were that it worked ok; running the container from within EU-West-2 region was suficient to get a timely alert for PS5 stock on amazon, and follow the link to a successful basket add.
+
+Dependencies:
+- Terraform 14
+
+##Getting started
+
+There's an example tfvars file to start you off; rename this with your own preferences.  Anything you can set in the `dotenv` file you'll need to set in terraform.tfvars to get the env vars into your fargate container.
+
+Authenticate yourself with your own AWS account as with any aws commandline tool.
+
+If you wish, add a specific section to your aws credentials file and set that profile name in `terraform.tfvars`.
+
+Then you can:
+```shell
+cd ./terraform
+terraform init
+
+terraform plan
+terraform apply
+```
+
+## What's included
+
+- container, running streetmerchant, with your chosen config
+- cloud metrics and a dashboard tracking 'out of stock' and 'error' responses from your configured stores