Fix auto-update digest comparison

Since images can have multiple digests, it is better
to compare the image ID as that will definitely change
on an update and each image can only have one ID.

Signed-off-by: Urvashi Mohnani <[email protected]>

pkg/autoupdate/autoupdate.go

@@ -316,7 +316,7 @@ func (t *task) localUpdateAvailable() (bool, error) {
 	if err != nil {
 		return false, err
 	}
-	return localImg.Digest().String() != t.image.Digest().String(), nil
+	return localImg.ID() != t.image.ID(), nil
 }
 
 // rollbackImage rolls back the task's image to the previous version before the update.