Create the temporary PCK export directory if it doesn't exist

This closes #45560.

editor/editor_export.cpp

@@ -1028,6 +1028,10 @@ Error EditorExportPlatform::_add_shared_object(void *p_userdata, const SharedObj
 Error EditorExportPlatform::save_pack(const Ref<EditorExportPreset> &p_preset, const String &p_path, Vector<SharedObject> *p_so_files, bool p_embed, int64_t *r_embedded_start, int64_t *r_embedded_size) {
 	EditorProgress ep("savepack", TTR("Packing"), 102, true);
 
+	// Create the temporary export directory if it doesn't exist.
+	DirAccessRef da = DirAccess::create(DirAccess::ACCESS_FILESYSTEM);
+	da->make_dir_recursive(EditorSettings::get_singleton()->get_cache_dir());
+
 	String tmppath = EditorSettings::get_singleton()->get_cache_dir().plus_file("packtmp");
 	FileAccess *ftmp = FileAccess::open(tmppath, FileAccess::WRITE);
 	ERR_FAIL_COND_V_MSG(!ftmp, ERR_CANT_CREATE, "Cannot create file '" + tmppath + "'.");