Update Template for Debian with fixes and improvements

common/template/debian13/debian.pkr.hcl

@@ -244,6 +244,10 @@ build {
   # Generalise the VM so every clone starts with a clean identity
   provisioner "shell" {
     inline = [
+      "set -e",
+      # Ensure BD ISOs are mounted (fstab handles this at boot via cdrom-detect/eject=false)
+      "for n in 1 2 3 4 5 6; do mountpoint -q /mnt/bd$n || mount /mnt/bd$n; done",
+
       # Remove SSH host keys — regenerated on first boot of each clone
       "sudo rm -f /etc/ssh/ssh_host_*",