php:5.4-fpmでapt-get updateを行うとエラーになった

$ docker run -it --rm php:5.4-fpm apt-get update
Get:1 http://security.debian.org jessie/updates InRelease [44.9 kB]
Get:2 http://security.debian.org jessie/updates/main amd64 Packages [824 kB]      
Ign http://httpredir.debian.org jessie InRelease                                                                                                                                                                                                                                                                             
Ign http://httpredir.debian.org jessie-updates InRelease
Get:3 http://httpredir.debian.org jessie Release.gpg [2420 B]
Ign http://httpredir.debian.org jessie-updates Release.gpg   
Get:4 http://httpredir.debian.org jessie Release [148 kB]
Ign http://httpredir.debian.org jessie-updates Release
Get:5 http://httpredir.debian.org jessie/main amd64 Packages [9098 kB]
Err http://httpredir.debian.org jessie-updates/main amd64 Packages
  
Err http://httpredir.debian.org jessie-updates/main amd64 Packages
  
Err http://httpredir.debian.org jessie-updates/main amd64 Packages
  
Err http://httpredir.debian.org jessie-updates/main amd64 Packages
  
Err http://httpredir.debian.org jessie-updates/main amd64 Packages
  404  Not Found
Fetched 10.1 MB in 30s (327 kB/s)
W: Failed to fetch http://httpredir.debian.org/debian/dists/jessie-updates/main/binary-amd64/Packages  404  Not Found

E: Some index files failed to download. They have been ignored, or old ones used instead.

どうやら /etc/apt/sources.list の中身が古い？ようなので php:5.6-fpm の内容を上書きしてやる

まず 5.6-fpm の内容を取得

$ docker run -it --rm php:5.6-fpm cat /etc/apt/sources.list
deb http://deb.debian.org/debian stretch main
deb http://security.debian.org/debian-security stretch/updates main
deb http://deb.debian.org/debian stretch-updates main

こいつを /etc/apt/sources.list に書き込んでやれば何か警告は出るけどもとりあえず通った

$ docker run -it --rm php:5.4-fpm /bin/bash -c 'echo "deb http://deb.debian.org/debian stretch main" > /etc/apt/sources.list;
> echo "deb http://security.debian.org/debian-security stretch/updates main" >> /etc/apt/sources.list;
> echo "deb http://deb.debian.org/debian stretch-updates main" >> /etc/apt/sources.list;
> apt-get update;'
Get:1 http://security.debian.org stretch/updates InRelease [94.3 kB]
Ign http://deb.debian.org stretch InRelease
Get:2 http://deb.debian.org stretch-updates InRelease [91.0 kB]
Get:3 http://deb.debian.org stretch Release.gpg [2434 B]                            
Get:4 http://deb.debian.org stretch Release [118 kB]                       
Get:5 http://security.debian.org stretch/updates/main amd64 Packages [601 kB] 
Get:6 http://deb.debian.org stretch-updates/main amd64 Packages [12.2 kB]       
Get:7 http://deb.debian.org stretch/main amd64 Packages [9478 kB]                        
Fetched 10.4 MB in 11s (911 kB/s)                                                                                                                                                                                                                                                                                            
Reading package lists... Done
W: There is no public key available for the following key IDs:
EF0F382A1A7B6500

Dockerfile に書く場合は下記の感じ

RUN echo "deb http://deb.debian.org/debian stretch main" > /etc/apt/sources.list \
    echo "deb http://security.debian.org/debian-security stretch/updates main" >> /etc/apt/sources.list \
    echo "deb http://deb.debian.org/debian stretch-updates main" >> /etc/apt/sources.list
RUN apt-get update

参考にしたサイト
https://qiita.com/rh_taro/items/40373a30ead444ae9ca7
https://github.com/tianon/docker-brew-debian/issues/31