Use common base image.

partials/fsg-image/Dockerfile

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+FROM debian:stable-slim
+MAINTAINER Stéphane Gourichon <stephane_sysadmin@gourichon.org>
+
+RUN echo 'Acquire::http { Proxy "http://host.containers.internal:3142"; };' > /etc/apt/apt.conf.d/01proxy
+
+RUN export DEBIAN_FRONTEND=noninteractive ; apt-get update && apt-get -y upgrade

partials/fsg-image/build.sh

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+#!/bin/bash
+
+set -xv
+
+cd -P "$(dirname "$(readlink -f "$0")" )"
+
+podman build -f Dockerfile -t fsg-base