feat(seeds): shorten the GDPR field to "DSGVO" and seed its join_description

test/seeds_test.exs

@@ -123,5 +123,24 @@ defmodule Mv.SeedsTest do
       assert mitglied.permission_set_name == "own_data",
              "Mitglied role must have own_data permission set"
     end
+
+    test "bootstrap seeds create the DSGVO custom field and not the old long name", %{
+      actor: actor
+    } do
+      {:ok, custom_fields} = Ash.read(Mv.Membership.CustomField, actor: actor)
+      names = Enum.map(custom_fields, & &1.name)
+
+      assert "DSGVO" in names, "Bootstrap seeds must create a custom field named DSGVO"
+
+      refute "Datenschutzerklärung akzeptiert" in names,
+             "Old long field name must no longer be seeded"
+
+      dsgvo = Enum.find(custom_fields, &(&1.name == "DSGVO"))
+      assert dsgvo.value_type == :boolean
+
+      assert dsgvo.join_description ==
+               "Ich habe die [Datenschutzerklärung](https://example.org/datenschutz) gelesen und akzeptiere sie.",
+             "DSGVO field must be seeded with a default join_description"
+    end
   end
 end