ci: ignore sourceware.org for markdown link checks

[MikeMcC399]

Description

In markdown_link_check_config.json

• Add the following to ignorePatterns:
  • https://sourceware.org

Motivation and Context

The workflow .github/workflows/markdown-link-check.yml is sporadically failing with Status 0 errors:

  [✖] https://sourceware.org/glibc/ → Status: 0

See workflow logs

The following manually executed command is succeeding, although it is very slow:

curl -I https://sourceware.org/glibc/

Types of changes

• Documentation
• Version change (Update, remove or add more Node.js versions)
• Variant change (Update, remove or add more variants, or versions of variants)
• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)
• Other (none of the above)

Checklist

• My code follows the code style of this project.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have read the CONTRIBUTING.md document.
• All new and existing tests passed.

[MikeMcC399]

@nschonni

Could you possibly review this one, as the link checking is flaky, causing the whole workflow to show failure.

[Copilot]

Pull request overview

This PR updates the markdown link checker configuration to ignore sourceware.org URLs, avoiding sporadic CI failures caused by Status: 0 responses when validating links to the glibc site.

Changes:

• Add an ignorePatterns entry for ^https://sourceware\.org/ in markdown_link_check_config.json.

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[nschonni]

I think it's better to replace/remove a flaky link, rather than ignoring it

[MikeMcC399]

I think it's better to replace/remove a flaky link, rather than ignoring it

It's only flaky when it's tested with markdown-link-check. It's difficult to know for sure in any particular case, but some sites have protection against automated link checking.

https://sourceware.org/glibc/ worked perfectly when I accessed it just now in Google Chrome. I don't think we should remove the link itself, and the content was updated a couple of days ago, so it seems to be providing relevant reference content.

[MikeMcC399]

This was fast today:

$ curl -I https://sourceware.org/glibc/
HTTP/2 200 
server: nginx
date: Wed, 29 Jul 2026 14:22:18 GMT
content-type: text/html; charset=UTF-8
content-length: 5614
last-modified: Mon, 27 Jul 2026 14:40:08 GMT
etag: "15ee-65798b2e6b34f"
accept-ranges: bytes
vary: Accept-Encoding
content-security-policy: default-src 'self' http: https:
strict-transport-security: max-age=16070400