[tmpnet] Enable externally accessible URIs for kube-hosted nodes

[maru-ava]

Why this should be merged

Previously, access from outside of a kube cluster was enabled by port-forwarding through the kube API. This approach turned out incompatible with load testing because it greatly limited the rate at which transactions could be sent.

The port-forwarding is replaced with nginx+ingress to ensure minimum overhead when running outside of a kube cluster.

How this works

• deploy kind cluster with a static NodePort
• deploy the nginx ingress operator with helm and configure to use the NodePort
• update kube runtime to create a service and ingress for each node to configure external accessibility via nginx
• replace GetLocalURI with simplified GetAccessibleURI
• enabled configuration of the base accessible URI to enable use of a hosted kube cluster

How this was tested

CI

Need to be documented in RELEASES.md?

N/A

TODO

• Perform self-review
• Ensure attribution for kind-with-registry.sh

[Copilot]

Pull Request Overview

This PR replaces port-forwarding with an externally accessible URI approach for kube-hosted nodes in order to improve load testing performance. Key changes include refactoring functions from GetLocalURI to GetAccessibleURI (and staking address equivalents), adding new logic to create Kubernetes Service and Ingress resources, and updating tests to use the new accessible URI methods.

Reviewed Changes

Copilot reviewed 21 out of 21 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
tests/fixture/tmpnet/utils.go	Updated error handling in CheckNodeHealth and simplified Node URI retrieval
tests/fixture/tmpnet/start_kind_cluster.go	Added functions to deploy and verify the nginx ingress controller via Helm
tests/fixture/tmpnet/process_runtime.go	Replaced GetLocalURI with GetAccessibleURI and updated staking address method
tests/fixture/tmpnet/node.go	Updated Node interface methods to use the accessible URI versions
tests/fixture/tmpnet/network.go	Updated network URI retrieval to use GetAccessibleURI
tests/fixture/tmpnet/kube_runtime.go	Refactored URI retrieval for nodes to support external access and added Service/Ingress
tests/fixture/tmpnet/flags/kube_runtime.go	Introduced new flag for base accessible URI configuration
tests/e2e/*	Updated tests to use GetAccessibleURI (and staking address) throughout
scripts/kind-with-registry.sh	Added a new script to set up kind with a local registry
flake.nix	Removed kind-with-registry derivation and updated PATH configuration