session-desktop/.aptly.conf

{
  "S3PublishEndpoints": {
    "signal-desktop-apt": {
      "region": "us-east-1",
      "bucket": "updates.signal.org",
      "prefix": "desktop/apt",
      "acl": "public-read",
      "plusWorkaround": false,
      "disableMultiDel": false
    }
  }
}