add zone_label migration

db/migrate/20220911134914_create_zone_labels.rb

@@ -0,0 +1,11 @@
+class CreateZoneLabels < ActiveRecord::Migration[6.1]
+  def change
+    create_table :zone_labels do |t|
+      t.belongs_to :zone, null: false, foreign_key: true
+      t.date :designated_on, null: false
+      t.string :name, null: false
+
+      t.timestamps
+    end
+  end
+end