Default to archive.debian.org for EOL Debian releases (#1083163)

Simon McVittierequested to merge
wip/bug1083163 into master

  • setup-testbed: Use archive.debian.org for archived buster security updates

    buster has reached end-of-life (even for LTS) and therefore is no longer present on security.debian.org.

    Helps: #1083163

  • build-docker: Default to archive.debian.org for EOL releases

    In particular this makes it possible to build test images for buster.

    Closes: #1083163

  • build-docker: Use old-releases.ubuntu.com for EOL Ubuntu releases

    Similar to #1083163.

  • build-qemu: Use archive.debian.org for EOL Debian releases

    Similar to #1083163.

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