fix(lighthouse): use newline-separated URLs and checkout@v4

[tehw0lf]

Summary

• The treosh/lighthouse-ci-action urls input expects a newline-separated string, not a JSON array. Passing ["https://tehwolf.de"] caused INVALID_URL / LighthouseError: INVALID_URL
• Fix the URL output to use heredoc multiline format so each URL is on its own line
• Fix actions/checkout@v6 → @v4 (v6 does not exist, causing workflow failures)

Test plan

• Trigger the weekly lighthouse scan workflow via workflow_dispatch after merge
• Confirm Lighthouse runs without INVALID_URL error
• Confirm results table appears in workflow summary

Summary by CodeRabbit

• Chores
  • Improved the Lighthouse scan workflow’s URL handling for more reliable audits when multiple pages are included.
  • Updated a workflow dependency to a newer version for better compatibility and maintenance.

[coderabbitai]

Caution

Review failed

Pull request was closed or merged during review

📝 Walkthrough

Walkthrough

The Lighthouse scan workflow now exports its URL list as newline-delimited output for $GITHUB_OUTPUT and updates actions/checkout to v4. The scan job structure and reporting steps stay the same.

Changes

Lighthouse scan workflow

Layer / File(s)	Summary
URL export and checkout update .github/workflows/lighthouse-scan.yml	The workflow reads inputs.urls as lines, appends the base URL with newline separation, exports urls via a multiline $GITHUB_OUTPUT entry, and updates actions/checkout to v4.

Estimated code review effort

🎯 2 (Simple) | ⏱️ ~10 minutes

Possibly related PRs

• tehw0lf/workflows#89: This earlier PR introduced the Lighthouse workflow that this change now modifies by adjusting URL assembly and tooling versioning.

Poem

🐇 I hopped through URLs, one line at a time,
Base URL tucked in a newline rhyme.
The scanner blinked and sprang to light,
With checkout dressed a bit more right.
Hoppy scans and tidy trails! 🌿

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly summarizes the main workflow fix: newline-separated Lighthouse URLs and the checkout version update.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch fix/lighthouse-url-format

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