fix: ignore ubuntu link checks

[LesnyRumcajs]

Summary of changes

Changes introduced in this pull request:

• seems to be failing from time to time since yesterday - https://github.com/ChainSafe/forest/actions/runs/17398074970/job/49384613874?pr=6010. Probably some bot protection.

Reference issue to close (if applicable)

Closes

Other information and links

Change checklist

• I have performed a self-review of my own code,
• I have made corresponding changes to the documentation. All new code adheres to the team's documentation standards,
• I have added tests that prove my fix is effective or that my feature works (if possible),
• I have made sure the CHANGELOG is up-to-date. All user-facing changes should be reflected in this document.

Summary by CodeRabbit

• Chores
  • Updated link-checker configuration to exclude the domain “ubuntu.com,” reducing false-positive failures during automated link checks.
  • Added a clarifying comment noting the likely cause (bot protection/404 in checker while working in browser).
  • Kept all other link-checker settings unchanged (timeouts, retry counts, and wait times).

[coderabbitai]

Walkthrough

Added a new domain exclusion to Lychee configuration: appended "ubuntu.com" to the exclude list in .config/lychee.toml with a clarifying comment. No other configuration values changed.

Changes

Cohort / File(s)	Summary
Lychee config exclude update .config/lychee.toml	Added comment about bot protection/404 and appended "ubuntu.com" to the exclude array; no changes to timeout, max_retries, or retry_wait_time.

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~2 minutes

Possibly related PRs

• fix(ci): link checker 403 Forbidden errors #5839 — Similar change adding linuxhint.com to .config/lychee.toml exclude list.
• fix: link check on wikipedia #5990 — Similar change adding wikipedia.org to .config/lychee.toml exclude list.

Suggested reviewers

• elmattic
• akaladarshi

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📥 Commits

Reviewing files that changed from the base of the PR and between 8ff95b3 and c669cf0.

📒 Files selected for processing (1)

• .config/lychee.toml (1 hunks)

🧰 Additional context used

🧠 Learnings (1)

📓 Common learnings

Learnt from: LesnyRumcajs
PR: ChainSafe/forest#5907
File: src/rpc/methods/state.rs:523-570
Timestamp: 2025-08-06T15:44:33.467Z
Learning: LesnyRumcajs prefers to rely on BufWriter's Drop implementation for automatic flushing rather than explicit flush() calls in Forest codebase.

🔇 Additional comments (2)

.config/lychee.toml (2)

24-25: Pragmatic exclusion to unblock CI — LGTM.

Adding ubuntu.com to the Lychee exclude list is a reasonable mitigation for bot protection flakiness.

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24-25: Verify ubuntu.com occurrences for regex coverage
rg returned no matches; manually inspect the repo for any “ubuntu.com” references (including subdomains) to ensure the proposed regex ^https?://([^.]+\.)?ubuntu\.com(/|$) covers every case.

✨ Finishing Touches

🧪 Generate unit tests

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch fix-ubuntu-link

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