Add auth token guard to start target

Author: HarshCasper

Makefile

@@ -63,6 +63,7 @@ curl-aws:		## Curl the AWS service load balancer
 
 start:			## Start LocalStack
 	@echo "Starting 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
 	@echo "LocalStack started successfully."