Add e2e tests

e2e/Dockerfile

+FROM ubuntu:18.04
+RUN apt-get update && \
+    apt-get install -y curl
+RUN curl -sfL https://github.com/heptio/sonobuoy/releases/download/v0.13.0/sonobuoy_0.13.0_linux_amd64.tar.gz | tar xvzf - -C /usr/bin
+COPY run-test.sh /usr/bin
+CMD ["/usr/bin/run-test.sh"]

e2e/docker-compose.yml

+version: '3'
+services:
+  server:
+    image: rancher/k3s:v0.1.0-rc8
+    command: server
+    environment:
+    - K3S_CLUSTER_SECRET=somethingtotallyrandom
+    volumes:
+    - config:/etc/rancher/k3s
+    tmpfs:
+    - /run
+    - /var/run
+    privileged: true
+
+  node:
+    image: rancher/k3s:v0.1.0-rc8
+    tmpfs:
+    - /run
+    - /var/run
+    privileged: true
+    environment:
+    - K3S_URL=https://server:6443
+    - K3S_CLUSTER_SECRET=somethingtotallyrandom
+
+  sonobuoy:
+    build: .
+    volumes:
+    - config:/etc/rancher/k3s
+
+volumes:
+  config: {}

e2e/run-test.sh

+#!/bin/bash
+set -e -x
+
+while [ ! -e /etc/rancher/k3s/k3s.yaml ]; do
+    echo waiting for config
+    sleep 1
+done
+
+mkdir -p /root/.kube
+sed 's/localhost/server/g' /etc/rancher/k3s/k3s.yaml > /root/.kube/config
+export KUBECONFIG=/root/.kube/config
+cat /etc/rancher/k3s/k3s.yaml
+cat $KUBECONFIG
+sonobuoy run
+sleep 15
+sonobuoy logs -f