TemplateURL takes a non-s3 scheme url

Author: keithduncan

Makefile

@@ -149,7 +149,7 @@ create-stack: build/aws-stack.yml env-STACK_NAME env-BUILDKITE_AWS_STACK_BUCKET
 		--output text \
 		--stack-name $(STACK_NAME) \
 		--disable-rollback \
-		--template-url "s3://$(BUILDKITE_AWS_STACK_BUCKET)/$(BUCKET_PREFIX)/aws-stack.yml" \
+		--template-url "https://$(BUILDKITE_AWS_STACK_BUCKET).s3.amazonaws.com/$(BUCKET_PREFIX)/aws-stack.yml" \
 		--capabilities CAPABILITY_IAM CAPABILITY_NAMED_IAM CAPABILITY_AUTO_EXPAND \
 		--parameters "$$(cat config.json)" \
 		"$(role_arn)"