Ability to specify which gateway to sidecar the extauth in multi-gateway deployment

[pszeto]

Version

1.14.x (latest stable)

Is your feature request related to a problem? Please describe.

Currently you are able to sidecar the extauth into the gateway proxy with the global.extensions.extAuth.envoySidecar option. For a multi gateway deployment https://docs.solo.io/gloo-edge/latest/installation/advanced_configuration/multi-gw-deployment/ it will side car all gateways with the extauth container.

Describe the solution you'd like

It would be nice to have the ability to specify which gateway to sidecar the extauth container in multi-gateway deployment.

Describe alternatives you've considered

No response

Additional Context

No response

[davidjumani]

Added in https://github.com/solo-io/solo-projects/pull/5503 and will be part of v1.16.0-beta3 when released