Update "Setting Nameservers for DNS01 Self Check" example

[Skulblaka]

I tried to apply the example for configuration alternative servers used for the DNS01 self check, since I'm having trouble with that on my DigitalOcean managed cluster.

Here are the commands I ran:

kubectl apply -f https://github.com/jetstack/cert-manager/releases/download/v1.3.0/cert-manager.yaml
kubectl --namespace cert-manager patch --type json deployment cert-manager -p "$(cat cert-manager.patch.json)"

cert-manager.patch.json:

[
  {
    "op": "add",
    "path": "/spec/template/spec/containers/0/args/-",
    "value": "--dns01-recursive-nameservers-only"
  },
  {
    "op": "add",
    "path": "/spec/template/spec/containers/0/args/-",
    "value": "--dns01-recursive-nameservers=\"8.8.8.8:53,1.1.1.1:53\""
  }
]

I get a Crashloopbackoff from the cert-manager pod however: Error: error validating options: invalid DNS server (address 8.8.8.8:53,1.1.1.1:53: too many colons in address): 8.8.8.8:53,1.1.1.1:53

After changing my patch to like the following it worked as expected:

[
  {
    "op": "add",
    "path": "/spec/template/spec/containers/0/args/-",
    "value": "--dns01-recursive-nameservers-only"
  },
  {
    "op": "add",
    "path": "/spec/template/spec/containers/0/args/-",
    "value": "--dns01-recursive-nameservers=\"8.8.8.8:53\""
  },
  {
    "op": "add",
    "path": "/spec/template/spec/containers/0/args/-",
    "value": "--dns01-recursive-nameservers=\"1.1.1.1:53\""
  }
]

I guess the "Comma separated string" part isn't valid anymore.

[jetstack-bot]

Hi @Skulblaka. Thanks for your PR.

I'm waiting for a cert-manager member to verify that this patch is reasonable to test. If it is, they should reply with /ok-to-test on its own line. Until that is done, I will not automatically test new commits in this PR, but the usual testing commands by org members will still work. Regular contributors should join the org to skip this step.

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[jetstack-bot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

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[jetstack-bot]

@Skulblaka: PR needs rebase.

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