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": "296ab86d-0bff-49db-afc9-b8442b1dd431",
    "type": "retrospective_processes",
    "attributes": {
      "name": "Retrospective Process 1",
      "description": "Retrospective Process 1 Description",
      "is_default": false,
      "created_at": "2025-08-26T21:16:27.546-07:00",
      "updated_at": "2025-08-26T21:16:27.546-07:00",
      "retrospective_process_matching_criteria": {
        "severity_ids": [
          "30c5573a-1276-458d-ab29-469aa33c87d2"
        ]
      }
    },
    "relationships": {
      "retrospective_steps": {
        "data": [
          {
            "id": "441414c9-6941-4102-9e2f-69ae92e9ae76",
            "type": "retrospective_steps"
          },
          {
            "id": "da53f751-065a-4c31-a6b4-14d486872d26",
            "type": "retrospective_steps"
          }
        ]
      },
      "severities": {
        "data": [
          {
            "id": "30c5573a-1276-458d-ab29-469aa33c87d2",
            "type": "severities"
          }
        ]
      }
    }
  }
}