feat: add Debian 13 golden image Packer pipeline and cloud-init bootstrap

ci/packer/scripts/04-cleanup.sh

@@ -0,0 +1,31 @@
+#!/usr/bin/env bash
+set -euo pipefail
+export DEBIAN_FRONTEND=noninteractive
+
+echo "=== [1/4] Purging APT Caches and Temp Files ==="
+apt-get autoremove -y --purge
+apt-get clean
+rm -rf /var/lib/apt/lists/* /tmp/* /var/tmp/*
+
+echo "=== [2/4] Resetting Machine Identity for Clones ==="
+truncate -s 0 /etc/machine-id
+rm -f /var/lib/dbus/machine-id
+ln -sf /etc/machine-id /var/lib/dbus/machine-id
+
+mkdir -p /etc/systemd/system/ssh.service.d
+cat << 'EOF_SSH_HOST' > /etc/systemd/system/ssh.service.d/10-generate-host-keys.conf
+[Service]
+ExecStartPre=-/usr/bin/ssh-keygen -A
+EOF_SSH_HOST
+ssh-keygen -A
+
+echo "=== [3/4] Resetting Cloud-Init State & Bash History ==="
+ufw delete allow 22/tcp 2>/dev/null || true
+cloud-init clean --logs --seed || true
+rm -rf /var/lib/cloud/*
+rm -f /root/.bash_history /home/*/.bash_history
+
+echo "=== [4/4] Syncing Filesystems ==="
+sync
+
+echo "=== Image Sanitization Complete ==="