github: add environment variable .env files

.github/environment/README.md

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+## Github Deployment Environments
+Github deployment environments are used to define unique settings for each environment i.e. staging and production
+
+The build and push workflows need to know which AWS account to push updated docker images to.
+
+### DotEnv Files
+The .env files in this directory are here as a record of the "variables" and their values.
+
+The variables can be updated from these files using the following command:
+```bash
+gh variable set -R aodn/<repo name> -e <environment name> -f <environment>.env
+
+```

.github/environment/production.env

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+AWS_REGION=ap-southeast-2
+ECR_REGISTRY=450356697252.dkr.ecr.ap-southeast-2.amazonaws.com
+ECR_REPOSITORY=api

.github/environment/staging.env

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+AWS_REGION=ap-southeast-2
+ECR_REGISTRY=450356697252.dkr.ecr.ap-southeast-2.amazonaws.com
+ECR_REPOSITORY=api