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": "566152e6-4463-422c-95df-39bc968f6b50",
    "type": "retrospective_processes",
    "attributes": {
      "name": "Retrospective Process 1",
      "description": "Retrospective Process 1 Description",
      "is_default": false,
      "created_at": "2025-12-21T12:10:31.280-08:00",
      "updated_at": "2025-12-21T12:10:31.280-08:00",
      "retrospective_process_matching_criteria": {
        "severity_ids": [
          "e8773bc7-da0d-471f-9160-4013aef5fdbb"
        ]
      }
    },
    "relationships": {
      "retrospective_steps": {
        "data": [
          {
            "id": "7bba9c5c-e73d-489c-9e45-80157cb84053",
            "type": "retrospective_steps"
          },
          {
            "id": "8a1dd331-e349-4101-b4ed-244c3fc88a18",
            "type": "retrospective_steps"
          }
        ]
      },
      "severities": {
        "data": [
          {
            "id": "e8773bc7-da0d-471f-9160-4013aef5fdbb",
            "type": "severities"
          }
        ]
      }
    }
  }
}