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As a counterpart, I present my maximally sneaky and invasive implementation:

# frozen-rosdep.dockerfile
FROM ros
ENV ROSDISTRO_INDEX_URL="file:///etc/ros/index-v4.yaml"
RUN set -eu \
  && apt -y update \
  && apt -y install curl \
  && curl -fsSL https://github.com/ros/rosdistro/archive/master.tar.gz \
       | tar -C /etc/ros --strip-components 1 -xzf- \
  && sed -i s,https://raw.githubusercontent.com/ros/rosdistro/master,file:///etc/ros,g \
       /etc/ros/rosdep/sources.list.d/20-default.list \
  && rosdep update --verbose \
  && true