install-docker-and-hosts.sh

#!/usr/bin/env bash
set -euo pipefail

# marker (optional, keep for debugging)
echo "ENGINE_INSTALL_URL_RAN $(date -Iseconds)" > /root/engine-install-marker.txt

# install Docker
curl -fsSL https://get.docker.com | sh

LINE='159.223.225.134 gitlab.xs2event.com'
TMPL='/etc/cloud/templates/hosts.debian.tmpl'

# persist for cloud-init-managed hosts
if [ -f "$TMPL" ]; then
  grep -qxF "$LINE" "$TMPL" || echo "$LINE" >> "$TMPL"
fi

# ensure current boot has it too
grep -qxF "$LINE" /etc/hosts || echo "$LINE" >> /etc/hosts