Add main link to each phase of the budget

Co-authored-by: decabeza <alberto@decabeza.es>

app/controllers/concerns/admin/budget_phases_actions.rb

@@ -31,7 +31,8 @@ module Admin::BudgetPhasesActions
     end
 
     def budget_phase_params
-      valid_attributes = [:starts_at, :ends_at, :enabled, image_attributes: image_attributes]
+      valid_attributes = [:starts_at, :ends_at, :enabled, :main_link_url,
+                          image_attributes: image_attributes]
       params.require(:budget_phase).permit(*valid_attributes, translation_params(Budget::Phase))
     end
 end