chore(ci): migrate from Shipfox to Namespace.so runners

[flemzord]

Summary

Migrate CI runners from Shipfox to Namespace.so as part of the org-wide CI infrastructure migration.

Per-workflow changes

• runs-on: shipfox-Xvcpu-ubuntu-2404 → runs-on: namespace-profile-linux-amd64-Xvcpu
• actions/checkout@v6 → namespacelabs/nscloud-checkout-action@v7 (git mirror caching, filter: tree:0 → dissociate: true)
• docker/setup-qemu-action removed (Namespace builds AMD64+ARM64 natively without emulation)
• docker/setup-buildx-action → namespacelabs/nscloud-setup-buildx-action@v0 (Remote Builders)

Pattern A composite (.github/actions/default/action.yml)

• nix-community/cache-nix-action@v7 → namespacelabs/nscloud-cache-action@v1 with cache: nix
• actions/cache@v5 → namespacelabs/nscloud-cache-action@v1 (paths preserved)

Validation

• Reference migration: chore(ci): migrate runners from Shipfox to Namespace.so ledger#1336 (4 successful runs measured, GoReleaser validated with multi-arch native build)

Test plan

• CI passes on this PR
• No regression in build duration vs prior shipfox runs
• GoReleaser works (add build-images label if needed to trigger)

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Path: .coderabbit.yaml

Review profile: CHILL

Plan: Pro

Run ID: 43667dbf-4ca7-4acb-8d12-19977ea99fe2

📥 Commits

Reviewing files that changed from the base of the PR and between eb9ce86 and 9be36fd.

📒 Files selected for processing (3)

• .github/actions/docker/action.yml
• .github/workflows/main.yml
• .github/workflows/releases.yml

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch chore/migrate-ci-shipfox-to-namespace

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