Use case

A default  
app/etc/env.php
  file is automatically generated during the Magento 2 deploy sequence, with everything needed in terms of connexion and credentials to stack services (MySQL, Redis, etc...).

If you would like to use your own 
env.php
  file, instead of the one generated by default, to include for example your own system configuration values in it, this guide will explain to you how to do so.
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