chore(task): backfill commune code from name task

app/tasks/maintenance/backfill_commune_code_from_name_task.rb

@@ -0,0 +1,28 @@
+# frozen_string_literal: true
+
+module Maintenance
+  class BackfillCommuneCodeFromNameTask < MaintenanceTasks::Task
+    attribute :champ_ids, :string
+    validates :champ_ids, presence: true
+
+    def collection
+      Champ.where(id: champ_ids.split(',').map(&:strip).map(&:to_i))
+    end
+
+    def process(champ)
+      return if champ.type != "Champs::CommuneChamp"
+      return if champ.external_id.present?
+      return if champ.value.blank?
+
+      data = champ.data
+      return if data.blank?
+      return if data['code_departement'].blank?
+
+      external_id = APIGeoService.commune_code(data['code_departement'], champ.value)
+
+      if external_id.present?
+        champ.update(external_id:)
+      end
+    end
+  end
+end