Add Makefile and standardize LocalStack auth token setup

Makefile

@@ -0,0 +1,37 @@
+export AWS_ACCESS_KEY_ID ?= test
+export AWS_SECRET_ACCESS_KEY ?= test
+export AWS_DEFAULT_REGION=us-east-1
+SHELL := /bin/bash
+
+usage:		## Show this help
+	@fgrep -h "##" $(MAKEFILE_LIST) | fgrep -v fgrep | sed -e 's/\\$$//' | sed -e 's/##//'
+
+install:	## Install dependencies
+	@which localstack || pip install localstack
+	@which awslocal || pip install awscli-local
+	@which tflocal || pip install terraform-local
+
+start:		## Start LocalStack
+	@test -n "${LOCALSTACK_AUTH_TOKEN}" || (echo "LOCALSTACK_AUTH_TOKEN is not set. Find your token at https://app.localstack.cloud/workspace/auth-token"; exit 1)
+	@LOCALSTACK_AUTH_TOKEN=$(LOCALSTACK_AUTH_TOKEN) localstack start -d
+
+stop:		## Stop LocalStack
+	@localstack stop
+
+ready:		## Wait until LocalStack is ready
+	@echo Waiting on the LocalStack container...
+	@localstack wait -t 30 && echo LocalStack is ready to use! || (echo Gave up waiting on LocalStack, exiting. && exit 1)
+
+logs:		## Save the logs in a separate file
+	@localstack logs > logs.txt
+
+deploy:		## Deploy infrastructure using Terraform
+	tflocal init
+	tflocal plan
+	tflocal apply --auto-approve
+
+test:		## Run Terraform tests
+	tflocal init
+	tflocal test
+
+.PHONY: usage install start stop ready logs deploy test

README.md

@@ -4,10 +4,20 @@ This is a simple example of how to use LocalStack to create a serverless image r
 
 ## Requirements
 
-- LocalStack CLI
-- Terraform CLI
-- `tflocal` wrapper script
-- `awslocal` wrapper script
+- LocalStack with the [`localstack` CLI](https://docs.localstack.cloud/getting-started/installation/#localstack-cli).
+- [Terraform CLI](https://www.terraform.io/downloads) with the [`tflocal` wrapper](https://github.com/localstack/terraform-local).
+- [AWS CLI](https://docs.localstack.cloud/user-guide/integrations/aws-cli/) with the [`awslocal` wrapper](https://docs.localstack.cloud/user-guide/integrations/aws-cli/#localstack-aws-cli-awslocal).
+- A valid [LocalStack for AWS license](https://localstack.cloud/pricing). Your license provides a [`LOCALSTACK_AUTH_TOKEN`](https://docs.localstack.cloud/getting-started/auth-token/) to activate LocalStack.
+
+## Start LocalStack
+
+Start LocalStack Pro with the `LOCALSTACK_AUTH_TOKEN` pre-configured:
+
+```bash
+export LOCALSTACK_AUTH_TOKEN=<your-auth-token>
+make start
+make ready
+```
 
 ## Build the Lambda function