add rank field to product variant

packages/medusa/src/models/product-variant.ts

@@ -63,6 +63,9 @@ export class ProductVariant {
   @Index({ unique: true, where: "deleted_at IS NOT NULL" })
   upc: string
 
+  @Column()
+  rank: number
+
   @Column({ type: "int" })
   inventory_quantity: number