contributing: instructions for -nodes=N
k8s-topgun tests are much better run concurrently rather than serially
given how slow the initialization times are compared to unit tests.
@@ -617,7 +617,11 @@ chart`][concourse-helm-chart] exists.
With those set, go to `topgun/k8s` and run Ginkgo:
```sh
+# run the test cases serially
ginkgo .
+
+# run the test cases with a concurrency level of 16
+ginkgo -nodes=16 .
```
[`kind`]: https://kind.sigs.k8s.io/
