ci: add do image build via packer

dev/packer/scripts/001-onboot.sh

@@ -0,0 +1,15 @@
+#!/bin/bash
+
+# Scripts in this directory will be executed by cloud-init on the first boot of droplets
+# created from your image.  Things ike generating passwords, configuration requiring IP address
+# or other items that will be unique to each instance should be done in scripts here.
+
+openssl rand -base64 32 > /etc/wiki/.db-secret
+
+if [[ -z $DATABASE_URL ]]; then
+  docker start db
+fi
+docker start wiki
+docker start wiki-update-companion
+# docker start nginx-proxy
+# docker start watchtower