Attach immutable output identity or a stable external builder failure

curl --request POST \
  --url http://127.0.0.1:18000/api/v1/optimized-artifacts/{id}/attest \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "attestation": {
    "build_evidence": {},
    "failure_code": "<string>",
    "output_digest": "<string>",
    "output_immutable_revision": "<string>",
    "output_repository": "<string>"
  }
}
'

import requests

url = "http://127.0.0.1:18000/api/v1/optimized-artifacts/{id}/attest"

payload = { "attestation": {
        "build_evidence": {},
        "failure_code": "<string>",
        "output_digest": "<string>",
        "output_immutable_revision": "<string>",
        "output_repository": "<string>"
    } }
headers = {
    "Authorization": "Bearer <token>",
    "Content-Type": "application/json"
}

response = requests.post(url, json=payload, headers=headers)

print(response.text)

const options = {
  method: 'POST',
  headers: {Authorization: 'Bearer <token>', 'Content-Type': 'application/json'},
  body: JSON.stringify({
    attestation: {
      build_evidence: {},
      failure_code: '<string>',
      output_digest: '<string>',
      output_immutable_revision: '<string>',
      output_repository: '<string>'
    }
  })
};

fetch('http://127.0.0.1:18000/api/v1/optimized-artifacts/{id}/attest', options)
  .then(res => res.json())
  .then(res => console.log(res))
  .catch(err => console.error(err));

package main

import (
	"fmt"
	"strings"
	"net/http"
	"io"
)

func main() {

	url := "http://127.0.0.1:18000/api/v1/optimized-artifacts/{id}/attest"

	payload := strings.NewReader("{\n  \"attestation\": {\n    \"build_evidence\": {},\n    \"failure_code\": \"<string>\",\n    \"output_digest\": \"<string>\",\n    \"output_immutable_revision\": \"<string>\",\n    \"output_repository\": \"<string>\"\n  }\n}")

	req, _ := http.NewRequest("POST", url, payload)

	req.Header.Add("Authorization", "Bearer <token>")
	req.Header.Add("Content-Type", "application/json")

	res, _ := http.DefaultClient.Do(req)

	defer res.Body.Close()
	body, _ := io.ReadAll(res.Body)

	fmt.Println(string(body))

}

{}

{
  "error": {
    "code": "<string>",
    "message": "<string>",
    "category": "<string>",
    "remediation": "<string>",
    "request_id": "<string>",
    "retryable": true
  }
}