Include file if exists on a Makefile

I found out that I can add the - symbol in front of the include call in a Makefile, and that will check if the file exists before including, so it won't show any error if the file is not there. Here's an example:

-include .env

.PHONY: console

.env:
	cp .env.example .env

console: ## Opens the App console.
	iex -S mix

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