While building the conda-analytics debian package, we ran into a debian related challenge where the buster-backports repo is no longer available which prevents us from building any images that include his repo on apt-update failure.
Using docker image sha256:005e63f9e66f5f76003f3a533a99253e3a38092b3b0823fddb134b8314f0f221 for docker-registry.wikimedia.org/wikimedia-buster:20210523 with digest docker-registry.wikimedia.org/wikimedia-buster@sha256:f67057421f6653f40907d3421a9666ef3fb140ef4e642ed572053deb5cca1b31 ... $ apt-get update Get:1 http://mirrors.wikimedia.org/debian buster InRelease [122 kB] Get:2 http://mirrors.wikimedia.org/debian buster-updates InRelease [56.6 kB] Ign:3 http://mirrors.wikimedia.org/debian buster-backports InRelease Get:4 http://apt.wikimedia.org/wikimedia buster-wikimedia InRelease [178 kB] Err:5 http://mirrors.wikimedia.org/debian buster-backports Release 404 Not Found [IP: 208.80.154.139 80] Get:6 http://security.debian.org buster/updates InRelease [34.8 kB] Get:7 http://mirrors.wikimedia.org/debian buster/main amd64 Packages [10.7 MB] Get:8 http://mirrors.wikimedia.org/debian buster-updates/main amd64 Packages [9745 B] Get:9 http://apt.wikimedia.org/wikimedia buster-wikimedia/main amd64 Packages [94.4 kB] Get:10 http://security.debian.org buster/updates/main amd64 Packages [775 kB] Reading package lists... E: The repository 'http://mirrors.wikimedia.org/debian buster-backports Release' does not have a Release file. Cleaning up project directory and file based variables 00:01 ERROR: Job failed: exit code 1
This is mentioned on T362518 as well.
We plan on moving the process to Bullseye to avoid this, and this is to track the changes and process for this.