Creates a retrospective process

curl --request POST \
  --url https://api.rootly.com/v1/retrospective_processes \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/vnd.api+json' \
  --data '
{
  "data": {
    "type": "retrospective_processes",
    "attributes": {
      "name": "<string>",
      "copy_from": "<string>",
      "description": "<string>",
      "retrospective_process_matching_criteria": {
        "severity_ids": [
          "<string>"
        ]
      }
    }
  }
}
'

{
  "data": {
    "id": "41e4ad53-6f99-4017-8a16-6ff1957faef0",
    "type": "retrospective_processes",
    "attributes": {
      "name": "Retrospective Process 1",
      "description": "Retrospective Process 1 Description",
      "is_default": false,
      "created_at": "2025-12-19T18:17:57.233-08:00",
      "updated_at": "2025-12-19T18:17:57.233-08:00",
      "retrospective_process_matching_criteria": {
        "severity_ids": [
          "0aa53857-b1e5-4dbb-8de0-5e258f7e887c"
        ]
      }
    },
    "relationships": {
      "retrospective_steps": {
        "data": [
          {
            "id": "2ebc7cc6-676e-48b7-9b4c-b0cbbcac6361",
            "type": "retrospective_steps"
          },
          {
            "id": "162bb9f3-b429-462c-998d-59017992fabb",
            "type": "retrospective_steps"
          }
        ]
      },
      "severities": {
        "data": [
          {
            "id": "0aa53857-b1e5-4dbb-8de0-5e258f7e887c",
            "type": "severities"
          }
        ]
      }
    }
  }
}