Symfony Cli in dev image

[Mathieudewet]

I wonder if it will not be great to have the Symfony CLI tool install in the Dev image,

Perhaps not by default but with a trigger ARG for build time.

Inside the Dockerfile Dev image Section we can something like the following :

# Symfony CLI tool
RUN apk add --no-cache bash && \
	curl -1sLf 'https://dl.cloudsmith.io/public/symfony/stable/setup.alpine.sh' | bash && \
	apk add symfony-cli && \
	apk del bash

[Mathieudewet]

Didn't see #288