✨ Shutdown Host Action (#22908)

Co-authored-by: Scott Lahteine <thinkyhead@users.noreply.github.com>

Marlin/src/feature/host_actions.cpp

@@ -80,6 +80,10 @@ void HostUI::action(FSTR_P const fstr, const bool eol) {
   #endif
 #endif
 
+#ifdef SHUTDOWN_ACTION
+  void HostUI::shutdown() { action(F(SHUTDOWN_ACTION)); }
+#endif
+
 #if ENABLED(HOST_PROMPT_SUPPORT)
 
   PromptReason HostUI::host_prompt_reason = PROMPT_NOT_DEFINED;

Marlin/src/feature/host_actions.h

@@ -71,6 +71,9 @@ class HostUI {
   #ifdef ACTION_ON_START
     static void start();
   #endif
+  #ifdef SHUTDOWN_ACTION
+    static void shutdown();
+  #endif
 
   #if ENABLED(G29_RETRY_AND_RECOVER)
     #ifdef ACTION_ON_G29_RECOVER