Add smallest image possible to use for e2e-testing

build/hello-kubernetes/Dockerfile

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+FROM scratch
+ADD hello /
+EXPOSE 8080
+ENTRYPOINT ["/hello"]

build/hello-kubernetes/hello.go

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+package main
+
+import (
+	"fmt"
+	"net/http"
+)
+
+func helloFromKubernetes(w http.ResponseWriter, r *http.Request) {
+	fmt.Fprintln(w, "Hello World! -- Kubernetes")
+}
+
+func main() {
+	http.HandleFunc("/", helloFromKubernetes)
+	err := http.ListenAndServe(":8080", nil)
+	if err != nil {
+		panic("ListenAndServe: " + err.Error())
+	}
+}

build/hello-kubernetes/prepare.sh

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+#!/bin/bash
+
+set -e
+set -x
+
+CGO_ENABLED=0 go build  -a -ldflags '-extldflags "-static" -s' hello.go