User Story:

As a (user persona), if the cluster has IPv6 enabled, I'd to configure route tables for dual-stack private subnets to have a route that directs IPv6 internet traffic (::/0) to the EgressOnlyInternetGateway (eigw).

Acceptance Criteria:

Description of criteria:

• A route needs adding to the managed route tables that directs IPv6 internet traffic to eigw.
• If the eigw is recreated, CAPA should ensure the route is up to date.

(optional) Out of Scope:

Detail about what is specifically not being delivered in the story

Engineering Details:

• https://github.com/kubernetes-sigs/cluster-api-provider-aws/blob/main/pkg/cloud/services/network/routetables.go 

This requires/does not require a design proposal.
This requires/does not require a feature gate.