netdata: survive a failed apt update, leave quietly on Cancel

The add-on runs on the Proxmox host, where the enterprise repository without a
subscription answers 401 and apt update exits 100 (2 of 3 failures in three
days). apt_update_safe retries, points at the enterprise repository and
carries on; the netdata repository was fetched fine.

Cancel in the first menu was reported as a failed run.

ct/metube.sh

@@ -36,7 +36,7 @@ function update_script() {
     source ~/.bashrc
     if ! command -v deno &>/dev/null; then
       export DENO_INSTALL="/usr/local"
-      curl -fsSL https://deno.land/install.sh | CI=1 $STD sh -s
+      curl -fsSL https://deno.land/install.sh | $STD sh -s -- -y
     else
       $STD deno upgrade
     fi

install/metube-install.sh

@@ -26,7 +26,7 @@ NODE_VERSION="24" NODE_MODULE="corepack,pnpm" setup_nodejs
 
 msg_info "Installing Deno"
 export DENO_INSTALL="/usr/local"
-curl -fsSL https://deno.land/install.sh | CI=1 $STD sh -s
+curl -fsSL https://deno.land/install.sh | $STD sh -s -- -y
 [[ ":$PATH:" != *":/usr/local/bin:"* ]] &&
   echo -e "\nexport PATH=\"/usr/local/bin:\$PATH\"" >>~/.bashrc &&
   source ~/.bashrc

tools/addon/netdata.sh

@@ -80,7 +80,7 @@ install() {
   msg_ok "Set up repository"
 
   msg_info "Installing ${APP}"
-  $STD apt update
+  apt_update_safe
   $STD apt install -y netdata
   msg_ok "Installed ${APP}"
   msg_ok "Completed successfully!\n"
@@ -108,7 +108,7 @@ OPTIONS=(Install "Install ${APP} on Proxmox VE"
   Uninstall "Uninstall ${APP} from Proxmox VE")
 
 CHOICE=$(whiptail --backtitle "Proxmox VE Helper Scripts" --title "${APP}" \
-  --menu "Select an option:" 10 58 2 "${OPTIONS[@]}" 3>&1 1>&2 2>&3)
+  --menu "Select an option:" 10 58 2 "${OPTIONS[@]}" 3>&1 1>&2 2>&3) || exit 0
 
 case $CHOICE in
 "Install") install ;;