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": "641d5e6f-3ae5-412c-a6b5-b27e4ab03dc4",
    "type": "retrospective_processes",
    "attributes": {
      "name": "Retrospective Process 1",
      "description": "Retrospective Process 1 Description",
      "is_default": false,
      "created_at": "2025-12-01T14:21:44.187-08:00",
      "updated_at": "2025-12-01T14:21:44.187-08:00",
      "retrospective_process_matching_criteria": {
        "severity_ids": [
          "5331c6ae-c253-4869-9c84-2dd0b74b8e35"
        ]
      }
    },
    "relationships": {
      "retrospective_steps": {
        "data": [
          {
            "id": "a35bc0a0-b485-4ba5-aafd-9abcd012d646",
            "type": "retrospective_steps"
          },
          {
            "id": "bb0127e3-76d2-4b5b-885c-3e63b2e5a2cf",
            "type": "retrospective_steps"
          }
        ]
      },
      "severities": {
        "data": [
          {
            "id": "5331c6ae-c253-4869-9c84-2dd0b74b8e35",
            "type": "severities"
          }
        ]
      }
    }
  }
}