feat(updater): add mode to only remind you to update when it's time (#10187)

Fixes #10187
Co-authored-by: NoPreserveRoot <NoPreserveRoot@pm.me>

templates/zshrc.zsh-template

@@ -26,6 +26,7 @@ ZSH_THEME="robbyrussell"
 # Uncomment the following lines to change the auto-update behavior
 # zstyle ':omz:update' mode disabled  # disable automatic updates
 # zstyle ':omz:update' mode auto      # update automatically without asking
+# zstyle ':omz:update' mode reminder  # just remind me to update when it's time
 
 # Uncomment the following line to change how often to auto-update (in days).
 # zstyle ':omz:update' frequency 13

tools/check_for_upgrade.sh

@@ -89,6 +89,8 @@ function update_ohmyzsh() {
   # Ask for confirmation before updating unless in auto mode
   if [[ "$update_mode" = auto ]]; then
     update_ohmyzsh
+  elif [[ "$update_mode" = reminder ]]; then
+    echo "[oh-my-zsh] It's time to update! You can do that by running \`omz update\`"
   else
     # input sink to swallow all characters typed before the prompt
     # and add a newline if there wasn't one after characters typed