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": "50456f9c-635b-40ba-b364-4bd0b188d738",
    "type": "retrospective_processes",
    "attributes": {
      "name": "Retrospective Process 1",
      "description": "Retrospective Process 1 Description",
      "is_default": false,
      "created_at": "2025-12-24T09:27:50.812-08:00",
      "updated_at": "2025-12-24T09:27:50.812-08:00",
      "retrospective_process_matching_criteria": {
        "severity_ids": [
          "3dfc6c9f-7aa5-425d-9d1d-f21b9ae9cebd"
        ]
      }
    },
    "relationships": {
      "retrospective_steps": {
        "data": [
          {
            "id": "a16437ec-f6fe-4566-8628-0607d915f578",
            "type": "retrospective_steps"
          },
          {
            "id": "6f87045e-9a43-4b4f-800d-b354c59c53e3",
            "type": "retrospective_steps"
          }
        ]
      },
      "severities": {
        "data": [
          {
            "id": "3dfc6c9f-7aa5-425d-9d1d-f21b9ae9cebd",
            "type": "severities"
          }
        ]
      }
    }
  }
}