npm: add Debian version check to update script (#8901)

Author: MickLesk

ct/nginxproxymanager.sh

@@ -28,6 +28,12 @@ function update_script() {
     exit
   fi
 
+  if [[ $(grep -E '^VERSION_ID=' /etc/os-release) == *"12"* ]]; then
+    msg_error "Wrong Debian version detected!"
+    msg_error "Please create a snapshot first. You must upgrade your LXC to Debian Trixie before updating. Visit: https://github.com/community-scripts/ProxmoxVE/discussions/7489"
+    exit
+  fi
+
   if command -v node &>/dev/null; then
     CURRENT_NODE_VERSION=$(node --version | cut -d'v' -f2 | cut -d'.' -f1)
     if [[ "$CURRENT_NODE_VERSION" != "22" ]]; then
@@ -144,7 +150,7 @@ EOF
   cd /app
   $STD yarn install --network-timeout 600000
   msg_ok "Initialized Backend"
-  
+
   msg_info "Updating Certbot"
   [ -f /etc/apt/trusted.gpg.d/openresty-archive-keyring.gpg ] && rm -f /etc/apt/trusted.gpg.d/openresty-archive-keyring.gpg
   [ -f /etc/apt/sources.list.d/openresty.list ] && rm -f /etc/apt/sources.list.d/openresty.list