Reuse a single checkout across CWI Windows jobs

[Copilot]

CWI created separate repository checkouts for each Windows job. Align it with CGO/CJS by caching one checkout and restoring it across the Windows build and integration jobs.

• Add a shared checkout-cache job using actions/cache/save.
• Replace per-job actions/checkout steps with actions/cache/restore.
• Ensure both Windows jobs depend on the shared cache.

- name: Restore checkout
  uses: actions/cache/restore@...
  with:
    path: .
    key: checkout-cwi-${{ github.sha }}
    fail-on-cache-miss: true

[Copilot]

Pull request overview

Adds a shared checkout cache for CWI’s Windows build and integration jobs.

Changes:

• Adds a centralized checkout/cache job.
• Restores the checkout in dependent Windows jobs.

Show a summary per file

File	Description
.github/workflows/CWI.yml	Replaces per-job checkouts with a shared cache.

Review details

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Suppressed comments (1)

.github/workflows/CWI.yml:108

• This Windows job cannot restore the Ubuntu-created cache with the default cache settings. Because cross-OS archives are opt-in and cache versions include the platform compression method, this exact-key lookup misses and fail-on-cache-miss fails the integration job. Enable cross-OS restore here as well (or save on Windows).

        uses: actions/cache/restore@55cc8345863c7cc4c66a329aec7e433d2d1c52a9   # v6.1.0
        with:
          path: .
          key: checkout-cwi-${{ github.sha }}
          fail-on-cache-miss: true

• Files reviewed: 1/1 changed files
• Comments generated: 1
• Review effort level: Balanced

[github-actions]

🎉 This pull request is included in a new release.

Release: v0.87.2