Add auth token guard to start target

Author: HarshCasper

Makefile

@@ -62,6 +62,7 @@ run:			## Execute a SQL query through the Lambda function
 
 start:			## Start LocalStack in detached mode
 		@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."