Add new template for debian trixie without luks encryption; fix disk resizing on first boot; set default user and ssh keys for cloud init

debian/13-trixie-luks/files/initial-setup.sh

@@ -279,6 +279,28 @@ refresh_partition_table() {
   fi
 }
 
+repair_gpt_backup_header() {
+  local disk="$1"
+
+  if command -v sgdisk >/dev/null 2>&1; then
+    if sgdisk -e "$disk" >/dev/null 2>&1; then
+      refresh_partition_table "$disk"
+      return 0
+    fi
+  fi
+
+  if parted -s "$disk" print >/dev/null 2>&1; then
+    return 0
+  fi
+
+  if printf 'Fix\n' | parted ---pretend-input-tty "$disk" print >/dev/null 2>&1; then
+    refresh_partition_table "$disk"
+    return 0
+  fi
+
+  return 1
+}
+
 wait_for_partition_growth() {
   local part="$1"
   local old_bytes="$2"
@@ -436,6 +458,10 @@ resize_lvm_on_luks() {
   log_info "Disk: ${DISK_DEV} | Partition number: ${PART_NUM}"
   [ -n "$LUKS_NAME" ] && log_info "LUKS mapper name: ${LUKS_NAME}"
 
+  if ! repair_gpt_backup_header "$DISK_DEV"; then
+    log_warn "Unable to repair or verify GPT backup header on ${DISK_DEV}; resize may fail."
+  fi
+
   if ! is_last_partition_on_disk "$DISK_DEV" "$PART_NUM"; then
     log_warn "Partition ${PART_NUM} is not the last partition on ${DISK_DEV}. Automatic growth is skipped."
     return 0