SettingsLayout: add check for updates checkbox

main.qml

@@ -1366,6 +1366,7 @@ ApplicationWindow {
         property int walletMode: 2
         property int lockOnUserInActivityInterval: 10  // minutes
         property bool blackTheme: true
+        property bool checkForUpdates: true
 
         property bool fiatPriceEnabled: false
         property bool fiatPriceToggle: false
@@ -2008,7 +2009,7 @@ ApplicationWindow {
         id: updatesTimer
         interval: 3600 * 1000
         repeat: true
-        running: !disableCheckUpdatesFlag
+        running: !disableCheckUpdatesFlag && persistentSettings.checkForUpdates
         triggeredOnStart: true
         onTriggered: checkUpdates()
     }

pages/settings/SettingsLayout.qml

@@ -58,6 +58,14 @@ Rectangle {
             text: qsTr("Custom decorations") + translationManager.emptyString
         }
 
+        MoneroComponents.CheckBox {
+            id: checkForUpdatesCheckBox
+            enabled: !disableCheckUpdatesFlag
+            checked: persistentSettings.checkForUpdates && !disableCheckUpdatesFlag
+            onClicked: persistentSettings.checkForUpdates = !persistentSettings.checkForUpdates
+            text: qsTr("Check for updates periodically") + translationManager.emptyString
+        }
+
         MoneroComponents.CheckBox {
             id: hideBalanceCheckBox
             checked: persistentSettings.hideBalance