chore: add cert-manager and external secrets

kustomization.yaml

@@ -5,3 +5,7 @@ resources:
 - postgres.yaml
 - rabbitmq.yaml
 - https://raw.githubusercontent.com/kubernetes/ingress-nginx/main/deploy/static/provider/kind/deploy.yaml
+- https://github.com/jetstack/cert-manager/releases/download/v1.11.0/cert-manager.yaml
+- certificates.yaml
+- external-secrets.yaml
+- secrets-store.yaml