[BUG] k3d proxy doesn't expose udp port properly

[k0da]

What did you do

• How was the cluster created?

  • k3d cluster create coredns-crd -p "1053:53/udp@loadbalancer" --k3s-server-arg "--no-deploy=traefik,metrics-server"

• What did you do afterwards?

  • Install coredns with LB service type

What did you expect to happen

dig @localhost -p1053 would reach coredns service inside cluster

Screenshots or terminal output

When exposing udp port, nginx shoudl be explicitly instructed to listen on udp, otherwise tcp is used.

Which OS & Architecture

• Linux, Windows, MacOS / amd64, x86, ...?

Which version of k3d

• k3d version v4.1.1

Which version of docker

 Version:           20.10.2
 API version:       1.41
 Go version:        go1.13.15
 Git commit:        2291f61
 Built:             Mon Dec 28 16:12:42 2020
 OS/Arch:           darwin/amd64
 Context:           default
 Experimental:      true

[iwilltry42]

Hi @k0da , thanks for opening this issue and especially providing a fix already 👍