Fix Php Redis extension installation

php-fpm/Dockerfile-71

@@ -84,7 +84,7 @@ RUN if [ ${INSTALL_XDEBUG} = false -a ${INSTALL_BLACKFIRE} = true ]; then \
 ARG INSTALL_PHPREDIS=false
 RUN if [ ${INSTALL_PHPREDIS} = true ]; then \
     # Install Php Redis Extension
-    pecl install -o -f redis \
+    printf "\n" | pecl install -o -f redis \
     &&  rm -rf /tmp/pear \
     &&  docker-php-ext-enable redis \
 ;fi