provision image through Terraform

examples/raspios/rootfs/lib/firstboot.sh

@@ -0,0 +1,7 @@
+#!/usr/bin/env bash
+
+# Generate a unique hostname
+NEW_HOSTNAME="rpi-$(cat /proc/cpuinfo | grep Serial | cut -d ' ' -f 2 | tail -c 5)"
+echo "$NEW_HOSTNAME" > /etc/hostname
+sed -i "s/raspberrypi/$NEW_HOSTNAME/g" /etc/hosts
+hostname "$NEW_HOSTNAME"

examples/raspios/rootfs/lib/systemd/system/firstboot.service

@@ -0,0 +1,14 @@
+[Unit]
+Description=FirstBoot
+After=network.target apt-daily.service apt-daily-upgrade.service
+Before=rc-local.service
+ConditionFileNotEmpty=/lib/firstboot.sh
+
+[Service]
+ExecStart=/bin/bash /lib/firstboot.sh
+ExecStartPost=/bin/mv /lib/firstboot.sh /lib/firstboot.sh.done
+Type=oneshot
+RemainAfterExit=no
+
+[Install]
+WantedBy=multi-user.target