Create workspace webhook

curl --request POST \
  --url https://cloud-api.phala.com/api/v1/workspace/webhooks \
  --header 'Content-Type: application/json' \
  --data '
{
  "url": "<string>",
  "events": [
    "<string>"
  ],
  "name": "<string>",
  "secret": "<string>"
}
'

{
  "id": "<string>",
  "url": "<string>",
  "events": [
    "<string>"
  ],
  "enabled": true,
  "created_at": "2023-11-07T05:31:56Z",
  "updated_at": "2023-11-07T05:31:56Z",
  "secret": "<string>",
  "name": "<string>"
}