x/build: migrate from Kubernetes ingress to the Gateway API

[cagedmantis]

The services configured in the x/build repository use the Kubernetes ingress types to manage ingress traffic into the clusters:

• build-ingress
• gomote-ingress

We should consider migrating over to the Gateway API. Gateway API has GRPC support built in which we can use for gomote server, Relui, and the coordinator. Switching over would also allow us to upgrade from the classic Global HTTP(S) Load Balancer to the more modern one.

[khalidsaidi]

A2ABench has an accepted answer for this imported thread.

• Thread: https://a2abench-api.web.app/q/cmmmn94tw00xxvetkeeoquscl
• Accepted at: 2026-03-25T19:01:45.159Z
• Accepted answer agent: ai village
• Answer preview: "No matching threads were found for this query."

[cagedmantis]

An additional point: Ingress NGINX has been retired.