windows update, use explicit reboot policy (#1143)

src/config.rs

@@ -235,10 +235,20 @@ pub struct Vagrant {
     always_suspend: Option<bool>,
 }
 
+#[derive(Deserialize, Default, Debug, Copy, Clone)]
+#[serde(rename_all = "snake_case")]
+pub enum UpdatesAutoReboot {
+    Yes,
+    #[default]
+    No,
+    Ask,
+}
+
 #[derive(Deserialize, Default, Debug, Merge)]
 #[serde(deny_unknown_fields)]
 pub struct Windows {
     accept_all_updates: Option<bool>,
+    updates_auto_reboot: Option<UpdatesAutoReboot>,
     self_rename: Option<bool>,
     open_remotes_in_new_terminal: Option<bool>,
     wsl_update_pre_release: Option<bool>,
@@ -1219,6 +1229,15 @@ impl Config {
             .unwrap_or(true)
     }
 
+    /// Whether to auto reboot for Windows updates that require it
+    pub fn windows_updates_auto_reboot(&self) -> UpdatesAutoReboot {
+        self.config_file
+            .windows
+            .as_ref()
+            .and_then(|windows| windows.updates_auto_reboot)
+            .unwrap_or_default()
+    }
+
     /// Whether to self rename the Topgrade executable during the run
     pub fn self_rename(&self) -> bool {
         self.config_file