Add SSH key to CoreOS authorized_keys via Kubernetes host access

add-my-ssh-key.yaml

apiVersion: extensions/v1beta1
kind: DaemonSet
metadata:
  name: add-my-ssh-key
  labels:
    application: add-my-ssh-key
spec:
  template:
    metadata:
      name: add-my-ssh-key
      labels:
        application: add-my-ssh-key
    spec:
      containers:
      - name: shell
        image: registry.opensource.zalan.do/stups/ubuntu:latest
        command:
          - /bin/bash
          - -c
        args:
          - "curl https://even.stups.zalan.do/public-keys/hjacobs/sshkey.pub -o /host-root/home/core/.ssh/authorized_keys.d/hjacobs && cat /host-root/home/core/.ssh/authorized_keys.d/hjacobs >> /host-root/home/core/.ssh/authorized_keys; sleep 99999"
        securityContext:
          privileged: true
        volumeMounts:
          - mountPath: /host-root
            name: host-root
      volumes:
        - name: host-root
          hostPath:
            path: /