Docker config/preinstall/postinstall steps

src/steps-config/20-docker.sh

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+#!/usr/bin/env bash
+
+task_begin "Configuring Docker apt repository";
+# curl -fsSL https://get.docker.com -o /tmp/get-docker.sh
+# chmod +x /tmp/get-docker.sh
+# sudo sh /tmp/get-docker.sh
+echo "deb [arch=$(dpkg --print-architecture)] http://download.docker.com/linux/raspbian buster stable" >/etc/apt/sources.list.d/docker.list;
+
+queue_apt_install docker-ce;
+
+task_end "$?";
+
+queue_preinstall_step "20-docker.sh";
+queue_postinstall_step "20-docker.sh";

src/steps-postinstall/20-docker.sh

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+#!/usr/bin/env bash
+
+if [[ ! -e "/etc/docker/daemon.json" ]]; then
+	task_begin "Updating Docker configuration";
+	echo '{"insecure-registries":["registry.service.mooncarrot.space:5000"]}' >/etc/docker/daemon.json;
+	task_end "$?";
+fi
+
+task_begin "Reloading docker systemd service";
+systemctl reload docker.service
+task_end "$?";

src/steps-preinstall/20-docker.sh

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+#!/usr/bin/env bash
+
+task_begin "docker: installing libseccomp2 from ${VERSION_CODENAME}-backports";
+# Fix apt update errors inside docker containers
+# Ref https://blog.samcater.com/fix-workaround-rpi4-docker-libseccomp2-docker-20/
+apt-get install libseccomp2 -t "${VERSION_CODENAME}-backports"
+task_end "$?";