Kubernetes example

[bennostein]

Putting this up for review now; should work as is if you follow instructions I added to ./examples/hackernews/README.md.

There's still some manual configuration changes required to scale out the followers of the Skip service: creating a corresponding skip-ingress-X service fronting each pod of the statefulset, and adding the routing logic to the reverse proxy.

The skip-ingress-X services can easily be scripted, but using the current setup changing that routing logic requires a HAProxy restart. I'm working on a more dynamic config for haproxy using maps, but that's still a WIP.

[bennostein]

Marked as ready for review: the app can now scale up/down to X skip instances with just a kubectl scale --replicas=$X (X >= 2, since the leader is included in the count).

Will write up a detailed blog post/tutorial but following the steps I added to the example/hackernews/README.md should work for now.

[hubyrod]

This is precision work 👌
One little change in the name of the container, a couple of suggestion for our local tooling (adding explicitly bash to the code section in markdown). Up to you :)