feat(test): replace cloudflare open-next build test with playwright tests

[dario-piotrowicz]

Description

Replaces the github workflow checking that the Cloudflare open-next build process works on PRs and pushes to main with a workflow that runs and checks the open-next build using playwright (built on top of the changes introduced in #7749)

Validation

I've validated this change by pushing this onto my fork's main branch and you can see the workflow working as expected there by checking the action runs (example)

Related Issues

Check List

• I have read the Contributing Guidelines and made commit messages that follow the guideline.
• I have run pnpm format to ensure the code follows the style guide.
• I have run pnpm test to check if all tests are passing.
• I have run pnpm build to check if the website builds without errors.
• I've covered new added functionality with unit tests if necessary.

[vercel]

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Name	Status	Preview	Updated (UTC)
nodejs-org	✅ Ready (Inspect)	Visit Preview	May 30, 2025 8:50pm

[Copilot]

Pull Request Overview

This PR replaces the GitHub workflow that verifies the Cloudflare open-next build with a new workflow that runs Playwright tests to validate the build.

• Updated Playwright configuration to support dynamic web server setup via environment variables.
• Replaced the Cloudflare worker build test with a Playwright test workflow that includes caching, browser installation, and report upload.

Reviewed Changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 2 comments.

File	Description
apps/site/playwright.config.ts	Updated Playwright configuration including conditional web server launch and dynamic baseURL setup.
.github/workflows/playwright-cloudflare-open-next.yml	Replaced the Cloudflare build job with a Playwright testing job along with concurrency and caching improvements.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 75.36%. Comparing base (d122e58) to head (daeddef).
Report is 13 commits behind head on main.

✅ All tests successful. No failed tests found.

Additional details and impacted files

@@ Coverage Diff @@## main #7782 +/- ##
=======================================
Coverage 75.35% 75.36% =======================================
Files 96 96 Lines 7861 7862 +1 Branches 192 192 =======================================
+ Hits 5924 5925 +1 
Misses 1936 1936 Partials 1 1 

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[AugustinMauroy]

LGMT !

[github-actions]

Lighthouse Results

URL	Performance	Accessibility	Best Practices	SEO	Report
/en	🟠 77	🟢 100	🟢 100	🟢 91	🔗
/en/about	🟢 100	🟢 100	🟢 100	🟠 82	🔗
/en/about/previous-releases	🟢 100	🟢 100	🟢 100	🟠 83	🔗
/en/download	🟢 98	🟢 100	🟢 100	🟢 91	🔗
/en/blog	🟢 100	🟢 100	🟢 96	🟢 92	🔗