tidy-docker:
	@docker image prune --all --force --filter="label=io.istio.repo=https://github.com/istio/tools" --filter="label!=io.istio.version=$(IMAGE_VERSION)"

# help works by looking over all Makefile includes matching `target: ## comment` regex and outputting them
help: ## Show this help
	@egrep -h '^[a-zA-Z_\.-]+:.*?## .*$$' $(MAKEFILE_LIST) | sort  | awk 'BEGIN {FS = ":.*?## "}; {printf "\033[36m%-20s\033[0m %s\n", $$1, $$2}'