update by mkumatag's comment,image can work without any of these crazy patches

guestbook/php-redis/Dockerfile

@@ -14,10 +14,6 @@
 
 FROM php:5-apache
 
-COPY fixup-apt-list.sh /
-RUN ["/fixup-apt-list.sh"]
-
-RUN apt-get update
 RUN pear channel-discover pear.nrk.io
 RUN pear install nrk/Predis
 

guestbook/php-redis/fixup-apt-list.sh

@@ -1,15 +0,0 @@
-#!/usr/bin/env bash
-
-DEB_ARCH=$(dpkg --print-architecture)
-
-# http://security.debian.org/debian-security/dists/jessie/updates/InRelease is missing
-# entries for some platforms, so we just remove the last line in sources.list in
-# /etc/apt/sources.list which is "deb http://deb.debian.org/debian jessie-updates main"
-
-case ${DEB_ARCH} in
-    arm64|ppc64el|s390x)
-        sed -i '/security/d' /etc/apt/sources.list
-        ;;
-esac
-
-exit 0