fix: FileAPL uses fileName (not filePath) for auth data path

src/saleor-app.ts

@@ -19,7 +19,9 @@ switch (process.env.APL) {
    * TODO: See docs
    */
   default:
-    apl = new FileAPL();
+    apl = new FileAPL({
+      fileName: process.env.AUTH_DATA_FILE_PATH || ".auth-data.json"
+    });
 }
 
 export const saleorApp = new SaleorApp({