OIDC: JWT validation with ALB controller and Gateway API

Introduction

AWS recently announced the general availability of Amazon Web Services (AWS) Load Balancer Controller support for Kubernetes Gateway API.

Furthermore, AWS added custom resource definitions (CRDs) to implement ELB listeners and target rules via a declarative approach.

Let's put these new possibilities into practice.

Since exposing a public endpoint to an EKS cluster is considered unsafe, I am going to add OIDC authorization to my EKS cluster and add JWT token validation with the ALB controller.