Increase zone size for transportserver from 256k to 512k

[jasonwilliams14]

Current zone size for transportserver is 256k.
When a large number of transportserver resources are deployed, it is possible that 256k is not enough memory allocated.

https://nginx.org/en/docs/stream/ngx_stream_upstream_module.html#zone

This RFE is to update the template from 256k to 512k.

https://github.com/nginxinc/kubernetes-ingress/blob/main/internal/configs/version2/nginx.transportserver.tmpl#L4

By increasing the value we ensure enough memory is allocated and the zone does not run out of memory.

[github-actions]

Hi @jasonwilliams14 thanks for reporting!

Be sure to check out the docs and the Contributing Guidelines while you wait for a human to take a look at this 🙂

Cheers!