参考: bash - Non-interactive apt upgrade - Super User

Apt 1.1以降

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ENV DEBIAN_FRONTEND=noninteractive

RUN apt-get update \
 && apt-get \
  -o Dpkg::Options::=--force-confold \
  -o Dpkg::Options::=--force-confdef \
  -y --allow-downgrades --allow-remove-essential --allow-change-held-packages upgrade

おまけ: Aptのキャッシュ消す

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apt clean && apt autoclean
rm -rf /var/lib/apt/lists/*