chore(ci): temporary token-wiring debug (log lengths only)

[thedavidmeister]

Temporary debug to diagnose the persistent cross-org flake-fetch 429 despite the github-token plumbing from #240/#242. Adds one step to nix-cachix-setup that logs the LENGTHS (never values) of inputs.github-token (what the plumbing delivers) and bare github.token (cross-org-empty hypothesis). Will be reverted once the wiring is confirmed.

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Path: .coderabbit.yaml

Review profile: CHILL

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Run ID: 42799724-33b3-46e5-b730-6088a3ed0bb6

📥 Commits

Reviewing files that changed from the base of the PR and between 0252a81 and 342752d.

📒 Files selected for processing (1)

• .github/actions/nix-cachix-setup/action.yml

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch debug/token-wiring

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[thedavidmeister]

Reviewed 342752d: temporary debug step logging only token lengths (never values) to diagnose the cross-org flake-fetch 429. Low risk, to be reverted once the wiring is confirmed. Approve.

[github-actions]

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