Kubernetize

[adamnovak]

This PR sets up some of what we need to work on Kubernetes-based Gitlab runners, and also changes our Docker build a bit so we have a hope of building under Kaniko.

The Kaniko-based build can't work without the fix for GoogleContainerTools/kaniko#1039, but after that it might start working.

[adamnovak]

I did manage to get this to build on the development version of Kaniko:

(kubectl delete job adamnovak-docker-builder || true) && kubectl apply -f - <<'EOF'
apiVersion: batch/v1
kind: Job
metadata:
  name: adamnovak-docker-builder
spec:
  ttlSecondsAfterFinished: 259200
  template:
    spec:
      containers:
      - name: kaniko
        image: gcr.io/kaniko-project/executor:debug-a1af057f997316bfb1c4d2d82719d78481a02a79
        args: ["--dockerfile=Dockerfile",
                "--context=git://github.com/adamnovak/vg.git#refs/heads/kubernetize",
                "--destination=quay.io/adamnovak/vg:kaniko",
                "--cache=false"]
        volumeMounts:
          - name: quay-adamnovak-vg-docker-config
            mountPath: /kaniko/.docker
        resources:
          requests:
            cpu: 8
            memory: "50Gi"
            ephemeral-storage: "50Gi"
          limits:
            cpu: 64
            memory: "50Gi"
            ephemeral-storage: "50Gi"
      restartPolicy: Never
      volumes:
      - name: quay-adamnovak-vg-docker-config
        secret:
          secretName: quay-adamnovak-vg-docker-config
  backoffLimit: 0
EOF

Don't steal my Kubernetes secrets that give access to my Quay vg, please. You also might not need --cache=false.