feat(ddns-updater): add DDNS-Updater LXC container script

Add bare-metal installation script for qdm12/ddns-updater with web UI
on port 8000, supporting 60+ DNS providers.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

ct/ddns-updater.sh

@@ -0,0 +1,61 @@
+#!/usr/bin/env bash
+source <(curl -fsSL https://raw.githubusercontent.com/community-scripts/ProxmoxVED/main/misc/build.func)
+# Copyright (c) 2021-2026 community-scripts ORG
+# Author: reptil1990
+# License: MIT | https://github.com/community-scripts/ProxmoxVED/raw/main/LICENSE
+# Source: https://github.com/qdm12/ddns-updater
+
+APP="DDNS-Updater"
+var_tags="${var_tags:-network}"
+var_cpu="${var_cpu:-1}"
+var_ram="${var_ram:-512}"
+var_disk="${var_disk:-2}"
+var_os="${var_os:-debian}"
+var_version="${var_version:-13}"
+var_unprivileged="${var_unprivileged:-1}"
+
+header_info "$APP"
+variables
+color
+catch_errors
+
+function update_script() {
+  header_info
+  check_container_storage
+  check_container_resources
+  if [[ ! -d /opt/ddns-updater ]]; then
+    msg_error "No ${APP} Installation Found!"
+    exit
+  fi
+  if check_for_gh_release "ddns-updater" "qdm12/ddns-updater"; then
+    msg_info "Stopping Service"
+    systemctl stop ddns-updater
+    msg_ok "Stopped Service"
+
+    msg_info "Backing up Data"
+    cp -r /opt/ddns-updater/data /opt/ddns-updater_data_backup
+    msg_ok "Backed up Data"
+
+    CLEAN_INSTALL=1 fetch_and_deploy_gh_release "ddns-updater" "qdm12/ddns-updater" "singlefile" "latest" "/opt/ddns-updater" "ddns-updater_*_linux_amd64"
+
+    msg_info "Restoring Data"
+    cp -r /opt/ddns-updater_data_backup/. /opt/ddns-updater/data/
+    rm -rf /opt/ddns-updater_data_backup
+    msg_ok "Restored Data"
+
+    msg_info "Starting Service"
+    systemctl start ddns-updater
+    msg_ok "Started Service"
+    msg_ok "Updated successfully!"
+  fi
+  exit
+}
+
+start
+build_container
+description
+
+msg_ok "Completed successfully!\n"
+echo -e "${CREATING}${GN}${APP} setup has been successfully initialized!${CL}"
+echo -e "${INFO}${YW} Access it using the following URL:${CL}"
+echo -e "${TAB}${GATEWAY}${BGN}http://${IP}:8000${CL}"

ct/headers/ddns-updater

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+    ____  ____  _   _______      __  __          __      __
+   / __ \/ __ \/ | / / ___/     / / / /___  ____/ /___ _/ /____  _____
+  / / / / / / /  |/ /\__ \_____/ / / / __ \/ __  / __ `/ __/ _ \/ ___/
+ / /_/ / /_/ / /|  /___/ /____/ /_/ / /_/ / /_/ / /_/ / /_/  __/ /
+/_____/_____/_/ |_//____/      \____/ .___/\__,_/\__,_/\__/\___/_/
+                                   /_/