Add TRUSTED_PROXIES and SYMFONY_TRUSTED_PROXIES for the local docker setup

[renaudhager]

Currently, when the local dev setup based on Docker Compose is running, a couple of environment variables are missing, which prevents the correct execution of Shopware.

The setup needs to add to the web service the 2 following environment variables:

• TRUSTED_PROXIES: REMOTE_ADDR
• SYMFONY_TRUSTED_PROXIES: REMOTE_ADDR