Merge pull request 'upgrade: verify that Forgejo upgrades show no migration warnings' (#446) from earl-warren/end-to-end:wip-10.0-migration into main

Reviewed-on: https://code.forgejo.org/forgejo/end-to-end/pulls/446

upgrade/upgrade.sh

@@ -46,6 +46,8 @@ function test_successful_upgrades() {
             fixture_assert
             doctor_run $config
         done
+
+        migration_assert
     done
 }