feat(downloads): add Linux x64 musl builds

[bellussi1]

Description

Adds a manual x64 (musl) download option for Alpine Linux. Compatibility ranges limit the option to Node.js release lines that publish Linux x64 musl artifacts, while x64 platform autodetection remains unchanged.

Validation

• Read the contributing guidelines and followed the commit conventions.
• Formatting and lint checks passed (Prettier, changed-file ESLint, and site lint).
• Unit tests passed: 162/162.
• Type checks passed (lint:types).
• Production build passed.
• Added tests for musl artifact URLs, supported release compatibility, and unchanged x64 autodetection.

Related Issues

Closes #9179

[vercel]

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Project	Deployment	Actions	Updated
nodejs-org	Ready	Preview	Oct 15, 2026 2:34pm UTC

[AugustinMauroy]

have you an related issue/pr that enable muse build ? that for historic

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 86.92%. Comparing base (d6f8d31) to head (fa40775).
⚠️ Report is 1 commits behind head on main.
✅ All tests successful. No failed tests found.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #9220      +/-   ##
==========================================
+ Coverage   86.07%   86.92%   +0.84%     
==========================================
  Files          86       87       +1     
  Lines        6075     6255     +180     
  Branches      361      375      +14     
==========================================
+ Hits         5229     5437     +208     
+ Misses        842      814      -28     
  Partials        4        4              

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[github-actions]

📦 Build Size Comparison

Summary

Metric	Value
Old Total First Load JS	7.20 MB
New Total First Load JS	7.20 MB
Delta	760.00 B (+0.01%)

Changes

🔄 Modified Routes (4)

Route	Old First Load JS	New First Load JS	Delta
/[locale]	1.69 MB	1.69 MB	📈 190.00 B (+0.01%)
/[locale]/[...path]	1.69 MB	1.69 MB	📈 190.00 B (+0.01%)
/[locale]/blog/[...path]	1.69 MB	1.69 MB	📈 190.00 B (+0.01%)
/[locale]/download/archive/[version]	1.69 MB	1.69 MB	📈 190.00 B (+0.01%)

[bellussi1]

@AugustinMauroy I couldn't find a related issue or PR for the original musl builds. This PR just adds the download option for the existing artifacts.