try to increase memory limit

Dockerfile

@@ -3,6 +3,6 @@ ENV TZ=Europe/Berlin
 COPY . .
 ONBUILD COPY composer.* ./
 USER root
-#RUN composer install --no-interaction --prefer-dist --optimize-autoloader --ignore-platform-reqs
+RUN php -d memory_limit=-1 composer install --no-interaction --prefer-dist --optimize-autoloader --ignore-platform-reqs
 RUN chown -R nobody:nobody /var/www/html
 USER nobody