use headless mode on ci

Author: alexeyraspopov

playwright.config.js

@@ -1,7 +1,9 @@
 import { defineConfig } from "@playwright/test";
 
+let CI = process.env.CI != null;
+
 export default defineConfig({
-  use: { headless: false },
+  use: { headless: CI },
   testMatch: /.*\.spec\.js/,
   reporter: [["list"], ["rollwright/coverage-reporter"]],
 });