Enable TLS without termination in Gateway API

[danail-branekov]

Description

In order to have a Gateway API gateway without TLS termination in Istio, we need to set the PILOT_ENABLE_ALPHA_GATEWAY_API env var to true on the istiod deployment.

Currently there is no way to do this via the Kyma Istio Resource Spec.

Reasons

This feature is requred by Korifi if it is to run on Kyma. Here is Korifi's Gateway definition

DoD:

• Provide unit and integration tests.
• Provide documentation.
• Verify if the solution works for both open-source Kyma and SAP BTP, Kyma runtime.
• If you changed the resource limits, explain why it was needed.
• Verify that your contributions don't decrease code coverage. If they do, explain why this is the case.
• Add release notes.

Attachments

[strekm]

closing in favour of #669