build-export: Regenerate summary for the repo

Summaries are the ostree mechanism to learn about available
branches (ie in our case, applications and runtimes) in
remote repositories. Therefore, we should generate summaries
for all our repositories.

xdg-app-builtins-build-export.c

@@ -219,6 +219,9 @@ xdg_app_builtin_build_export (int argc, char **argv, GCancellable *cancellable,
   g_print ("Content Written: %u\n", stats.content_objects_written);
   g_print ("Content Bytes Written: %" G_GUINT64_FORMAT "\n", stats.content_bytes_written);
 
+  if (!ostree_repo_regenerate_summary (repo, NULL, cancellable, error))
+    goto out;
+
   ret = TRUE;
 
  out: