mutation AppendBuildLogChunks($buildId: ID!, $chunks: [BuildLogChunkInput!]!) {
  appendBuildLogChunks(buildId: $buildId, chunks: $chunks) {
    id
    scope
    scopeId
    sequence
    phase
    stream
  }
}

{
  "buildId": "id",
  "chunks": [
    {
      "scope": "string",
      "scopeId": "id",
      "sequence": 1,
      "phase": "string",
      "stream": "STDOUT",
      "dataBase64": "string",
      "byteLength": 1,
      "createdAt": "string"
    }
  ]
}

{
  "data": {
    "appendBuildLogChunks": [
      {
        "id": "id",
        "scope": "string",
        "scopeId": "id",
        "sequence": 1,
        "phase": "string",
        "stream": "STDOUT"
      }
    ]
  }
}