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try this:
```issuer_secret = pulumi_kubernetes.core.v1.Secret(
        "cluster-issuer-secret",
        metadata={"name": "ca-issuer", "namespace": "cert-manager"},
        type="<http://kubernetes.io/tls|kubernetes.io/tls>",
        string_data={"tls.key": key.private_key_pem, "tls.crt": key.cert_pem},
    )```