chore: use Namespace cluster action for QA chart tests (#14)

## Summary
- replace kind-based Kubernetes provisioning with Namespace nscloud
setup + cluster action for chart installs
- pin to specific commit SHAs and request 4x16 shape to ensure
chart-testing throughput

## Testing
- bun run check
- bun run typecheck
- bun run test

## Summary by Sourcery

CI:
- Replace helm/kind-action with namespacelabs/nscloud-setup and
nscloud-cluster-action for Kubernetes provisioning in QA workflow,
pinned to specific commit SHAs and configured with 4x16 machine shape

Author: roderik

.github/workflows/qa.yml

@@ -205,9 +205,18 @@ jobs:
           CT_CONFIG: .github/ct.yaml
         run: ct lint --config "$CT_CONFIG" --validate-yaml=false
 
-      - name: Create kind cluster
+      - name: Configure Namespace access
         if: (github.event_name == 'pull_request' || github.event_name == 'push') && steps.ct-changed.outputs.changed == 'true'
-        uses: helm/kind-action@a1b0e391336a6ee6713a0583f8c6240d70863de3 # v1.12.0
+        id: nscloud
+        uses: namespacelabs/nscloud-setup@v0
+
+      - name: Provision Namespace Kubernetes cluster
+        if: (github.event_name == 'pull_request' || github.event_name == 'push') && steps.ct-changed.outputs.changed == 'true'
+        uses: namespacelabs/nscloud-cluster-action@v0
+        with:
+          wait-kube-system: "true"
+          machine-shape: "4x16"
+          duration: "20m"
 
       - name: Run chart-testing (install)
         if: (github.event_name == 'pull_request' || github.event_name == 'push') && steps.ct-changed.outputs.changed == 'true'