kube/cert-manager/README.md

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# cert-manager
`cert-manager` is used to obtain TLS certificates from Let's Encrypt.
Added manifest with:
```
curl -L https://github.com/jetstack/cert-manager/releases/download/v1.15.1/cert-manager.yaml -O
```
To update certificate issuer
```
kubectl apply -f cert-manager.yaml
kubectl apply -f issuer.yml
kubectl -n cert-manager create secret generic tsig-secret \
--from-literal=TSIG_SECRET=<secret>
```
Workaround for webhook timeout issue https://github.com/jetstack/cert-manager/issues/2602
It's not very clear why this is happening, deserves further investigation - presumably Calico related somehow:
```
kubectl delete mutatingwebhookconfiguration.admissionregistration.k8s.io cert-manager-webhook
kubectl delete validatingwebhookconfigurations.admissionregistration.k8s.io cert-manager-webhook
```