Update dockerfile to change chmod after composer install

docker/php/Dockerfile

@@ -10,12 +10,12 @@ RUN apt update && apt install -y zlib1g-dev g++ git libicu-dev zip libzip-dev zi
 ADD ./Back_end /var/www/symfony_docker
 WORKDIR /var/www/symfony_docker
 
-RUN chmod 777 -R /var/www/symfony_docker/var
-
 RUN curl -sS https://getcomposer.org/installer | php -- --install-dir=/usr/local/bin --filename=composer
 
 RUN curl -sS https://get.symfony.com/cli/installer | bash
 RUN mv /root/.symfony5/bin/symfony /usr/local/bin/symfony
 
 ENV COMPOSER_ALLOW_SUPERUSER=1
-RUN composer install
\ No newline at end of file
+RUN composer install
+
+RUN chmod 777 -R /var/www/symfony_docker/var
\ No newline at end of file