initial showpiece patches

stage9/01-docker/00-packages

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+apt-transport-https
+gnupg2
+software-properties-common

stage9/01-docker/01-run-chroot.sh

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+#!/bin/bash
+#change to "debian" if necessary:
+curl -fsSL https://download.docker.com/linux/$(. /etc/os-release; echo "$ID")/gpg | sudo apt-key add -
+echo "deb [arch=$(dpkg --print-architecture)] https://download.docker.com/linux/$(. /etc/os-release; echo "$ID") \
+     $(lsb_release -cs) stable" | \
+tee /etc/apt/sources.list.d/docker.list
+apt update

stage9/01-docker/02-packages

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+docker-ce
+docker-compose-plugin
+cgroupfs-mount

stage9/01-docker/03-run-chroot.sh

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+#!/bin/bash
+systemctl enable docker
+systemctl start docker
+gpasswd -a pi docker
+newgrp docker