This works for me:
docker.io/focal-proposed,now 20.10.7-0ubuntu5~20.04.1 amd64 [installed]

The original error I had during a 'docker build' was:

Errors during downloading metadata for repository 'fedora':
  - Curl error (6): Couldn't resolve host name for 
https://mirrors.fedoraproject.org/metalink?repo=fedora-35&arch=x86_64 
[getaddrinfo() thread failed to start]
Error: Failed to download metadata for repo 'fedora': Cannot prepare internal 
mirrorlist: Curl error (6): Couldn't resolve host name for 
https://mirrors.fedoraproject.org/metalink?repo=fedora-35&arch=x86_64 
[getaddrinfo() thread failed to start]
The command '/bin/sh -c dnf install --assumeyes git make valgrind diffutils 
which findutils langpacks-en &&     dnf clean all' returned a non-zero code: 1

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https://bugs.launchpad.net/bugs/1938908

Title:
   Backport the container stack in Impish

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