Avoid errors when symfony-cli installation

[Abdou741]

Hi,
Good work ! 👍

symfony-docker-starter/.docker/php/Dockerfile

Lines 48 to 49 in 4c1215c

	RUN curl -sS https://get.symfony.com/cli/installer | bash
	RUN mv /root/.symfony/bin/symfony /usr/local/bin/symfony

Return that (In my tests) :

 => ERROR [stage-1 15/16] RUN mv /root/.symfony/bin/symfony /usr/local/bin/symfony                                                                                                                          0.6s
------
 > [stage-1 15/16] RUN mv /root/.symfony/bin/symfony /usr/local/bin/symfony:
#0 0.536 mv: cannot stat '/root/.symfony/bin/symfony': No such file or directory
------
failed to solve: executor failed running [/bin/sh -c mv /root/.symfony/bin/symfony /usr/local/bin/symfony]: exit code: 1

Maybe better with this remplacment for avoid errors :

RUN curl -1sLf 'https://dl.cloudsmith.io/public/symfony/stable/setup.deb.sh' | bash
RUN apt install symfony-cli