type CertsDump struct {
	Identity  string  `json:"identity"`
	State     string  `json:"state"`
	CertChain []*Cert `json:"cert_chain"`
}

type Cert struct {
	Pem            string `json:"pem"`
	SerialNumber   string `json:"serial_number"`
	ValidFrom      string `json:"valid_from"`
	ExpirationTime string `json:"expiration_time"`

type CertsDump struct {
	Identity  string  `json:"identity"`
	State     string  `json:"state"`
	CertChain []*Cert `json:"certChain"`
}

type Cert struct {
	Pem            string `json:"pem"`
	SerialNumber   string `json:"serialNumber"`
	ValidFrom      string `json:"validFrom"`
	ExpirationTime string `json:"expirationTime"`
}

type WorkloadState struct {
	State       string              `json:"state,omitempty"`

			for i, ca := range secret.CertChain {
				t := "Intermediate"
				if i == 0 {
					t = "Leaf"
				} else if i == len(secret.CertChain)-1 {
					t = "Root"
				}
				n := new(big.Int)
				n, _ = n.SetString(ca.SerialNumber, 10)
				fmt.Fprintf(w, "%v\t%v\t%v\t%v\t%x\t%v\t%v\n",
					secret.Identity, t, secret.State, certNotExpired(ca), n, valueOrNA(ca.ExpirationTime), valueOrNA(ca.ValidFrom))
			}
		}
	}
	return w.Flush()
}

    builder = builder.addSubjectAlternativeName("")
    builder = builder.commonName("")
    builder = builder.organizationalUnit("")
    builder = builder.serialNumber(BigInteger.ZERO)
    builder = builder.serialNumber(0L)
    builder = builder.keyPair(keyPair)
    builder = builder.keyPair(keyPair.public, keyPair.private)
    builder = builder.signedBy(HeldCertificate.Builder().build())

          "serialNumber": "305554775863395697262503895661564044819",
          "validFrom": "2023-03-21T13:02:57Z",
          "expirationTime": "2033-03-22T13:04:57Z"
        },
        {

	notAfter := notBefore.Add(validFor)

	serialNumberLimit := new(big.Int).Lsh(big.NewInt(1), 128)
	serialNumber, err := crand.Int(crand.Reader, serialNumberLimit)
	if err != nil {
		return nil, nil, fmt.Errorf("failed to generate serial number: %w", err)
	}

	template := x509.Certificate{
		SerialNumber: serialNumber,
		Subject: pkix.Name{
			Organization: []string{"Acme Co"},
		},
		NotBefore: notBefore,