Fix rollbacks by loading app even then

backend/lib/archive/release_migrator.ex

@@ -6,17 +6,19 @@ defmodule Tilastokeskus.Archive.ReleaseMigrator do
   @app :tilastokeskus
 
   def migrate() do
+    Application.load(@app)
+
     for repo <- repos() do
       {:ok, _, _} = Ecto.Migrator.with_repo(repo, &Ecto.Migrator.run(&1, :up, all: true))
     end
   end
 
   def rollback(repo, version) do
+    Application.load(@app)
     {:ok, _, _} = Ecto.Migrator.with_repo(repo, &Ecto.Migrator.run(&1, :down, to: version))
   end
 
   defp repos() do
-    Application.load(@app)
     Application.fetch_env!(@app, :ecto_repos)
   end
 end