feat: Add MSVC asset matching on Windows

[trolleyman]

See #6726

Adds MSVC asset detection, and modifies the matcher to prefer it for Windows builds

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Note

Adds MSVC libc detection and preference for Windows asset selection, updates docs to mention MSVC, expands tests, and improves an aqua error message.

• Backend – asset detection:
  • Add Msvc to AssetLibc with matching regex; detect libc for Windows as well as Linux.
  • AssetPicker now sets target libc to msvc on Windows and scores libc on Windows; prefers MSVC over GNU.
• Tests:
  • Add Windows MSVC/GNU URL detection and scoring tests; verify MSVC preference; extend ripgrep tests for Windows.
• Docs:
  • Update docs/dev-tools/backends/{github,gitlab}.md to include MSVC in libc autodetection.
  • Update docs/dev-tools/backends/ubi.md matching option to mention "msvc".
• Aqua backend:
  • Enhance unsupported env error to include supported envs in message.

^{Written by Cursor Bugbot for commit 70fa91b. This will update automatically on new commits. Configure here.}

[jdx]

bugbot run

[cursor]

Bug: Test Fails on Non-Musl Builds

The test unconditionally expects the musl variant to be picked on line 588, but when the build is not musl (i.e., when cfg!(target_env = "musl") is false), the gnu variant should be preferred since the AssetPicker is initialized with target_libc="gnu" (line 179). This test will fail on non-musl builds. It should be conditional like the similar test at lines 422-428.

src/backend/asset_detector.rs#L584-L588

mise/src/backend/asset_detector.rs

Lines 584 to 588 in 70fa91b

	// Test Linux x86_64 - should prefer musl over other variants when only musl is available
	let picker = AssetPicker::new("linux".to_string(), "x86_64".to_string());
	let picked = picker.pick_best_asset(&ripgrep_assets).unwrap();
	assert_eq!(picked, "ripgrep-14.1.1-x86_64-unknown-linux-musl.tar.gz");

 

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[trolleyman]

Thanks for the speedy review :D