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": "99c6577d-c5c6-47ba-be95-b4879c33c57b",
    "type": "retrospective_processes",
    "attributes": {
      "name": "Retrospective Process 1",
      "description": "Retrospective Process 1 Description",
      "is_default": false,
      "created_at": "2025-12-17T03:36:07.618-08:00",
      "updated_at": "2025-12-17T03:36:07.618-08:00",
      "retrospective_process_matching_criteria": {
        "severity_ids": [
          "26f3de58-bacd-4678-85a3-f04931ca292a"
        ]
      }
    },
    "relationships": {
      "retrospective_steps": {
        "data": [
          {
            "id": "dc50e1bb-3a8b-4b33-825a-264d7e7f2fba",
            "type": "retrospective_steps"
          },
          {
            "id": "f4b9322d-66ea-453a-9104-85c8f2038ecc",
            "type": "retrospective_steps"
          }
        ]
      },
      "severities": {
        "data": [
          {
            "id": "26f3de58-bacd-4678-85a3-f04931ca292a",
            "type": "severities"
          }
        ]
      }
    }
  }
}