curl --request POST \
  --url https://api.blaxel.ai/v0/customdomains \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "metadata": {
    "displayName": "Preview Domain",
    "labels": {},
    "name": "preview.example.com",
    "workspace": "<string>"
  },
  "spec": {
    "cnameRecords": "<string>",
    "region": "us-pdx-1",
    "txtRecords": {}
  }
}
'

{
  "metadata": {
    "createdAt": "<string>",
    "updatedAt": "<string>",
    "createdBy": "<string>",
    "updatedBy": "<string>",
    "displayName": "Preview Domain",
    "labels": {},
    "name": "preview.example.com",
    "workspace": "<string>"
  },
  "spec": {
    "cnameRecords": "<string>",
    "lastVerifiedAt": "<string>",
    "region": "us-pdx-1",
    "status": "verified",
    "txtRecords": {},
    "verificationError": "<string>"
  }
}