cert-manager is a Kubernetes add-on that automates TLS certificate issuance and renewal. SpinKube uses it to secure admission webhooks, allowing the Kubernetes API server to communicate with the operator over HTTPS when validating or defaulting Spin application resources. section 8.2.1
kubectl apply -f https://github.com/cert-manager/cert- ➥manager/releases/download/v1.14.3/cert-manager.yaml kubectl wait --for=condition=available --timeout=300s deployment/cert- ➥manager-webhook -n cert-manager
Install cert-manager from the v1.14.3 manifest, then wait for its webhook deployment to become available before installing SpinKube. section 8.2.1

