add a simple kubenetes.yaml file

[bbigras]

as discussed on discord:

https://discord.com/channels/708122962422792194/800442937602342922/913545032760455212

[CLAassistant]

All committers have signed the CLA.

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[bbigras]

a traefik ingress should be something like:

apiVersion: networking.k8s.io/v1
kind: Ingress
metadata:
  name: athens
  annotations:
    kubernetes.io/ingress.class: "traefik"
spec:
  rules:
  - host: athens.my_domain.com
    http:
      paths:
      - path: /
        pathType: Prefix
        backend:
          service:
            name: athens
            port:
              number: 3010