Add NetBird scripts with correct ProxmoxVED source URL

Fix the build.func source URL to use ProxmoxVED instead of ProxmoxVE,
allowing the scripts to actually run in this repository.

ct/netbird.sh

@@ -0,0 +1,48 @@
+#!/usr/bin/env bash
+
+source <(curl -fsSL https://raw.githubusercontent.com/community-scripts/ProxmoxVED/main/misc/build.func)
+# Copyright (c) 2021-2025 community-scripts ORG
+# Author: TechHutTV
+# License: MIT | https://github.com/community-scripts/ProxmoxVE/raw/main/LICENSE
+# Source: https://netbird.io/
+
+APP="NetBird"
+var_tags="network;vpn"
+var_cpu="1"
+var_ram="512"
+var_disk="4"
+var_os="debian"
+var_version="13"
+var_unprivileged="1"
+var_tun="${var_tun:-yes}"
+
+header_info "$APP"
+variables
+color
+catch_errors
+
+function update_script() {
+header_info
+check_container_storage
+check_container_resources
+
+if [[ ! -f /etc/netbird/config.json ]]; then
+msg_error "No ${APP} Installation Found!"
+exit
+fi
+
+msg_info "Updating ${APP}"
+$STD apt update
+$STD apt -y upgrade
+msg_ok "Updated Successfully"
+exit
+}
+
+start
+build_container
+description
+
+msg_ok "Completed Successfully!\n"
+echo -e "${CREATING}${GN}${APP} setup has been successfully initialized!${CL}"
+echo -e "${INFO}${YW} Access NetBird by entering the container and running:${CL}"
+echo -e "${TAB}${GATEWAY}${BGN}netbird up${CL}"