Package python3-configobj

Tails Installer uses configobj whose python3 version is not in debian. It is supported upstream (https://github.com/DiffSK/configobj/blob/b75f39b4e44f6e6ce422921a8734169a4324f223/docs/configobj.rst) and should be packaged.

Original created by @alant on 7789 (Redmine)

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