Trying to run a simple Swift Function

func main(req: RequestValue, res: RequestResponse) throws -> RequestResponse {
    let payload = req.payload.isEmpty ? "No payload provided. Add custom data when executing function" : req.payload
    
    let secretKey = req.variables["SECRET_KEY"] ?? "SECRET_KEY variable not found. You can set it in Function settings."

    let randomNumber = Double.random(in: 0...1)

    let trigger = req.variables["APPWRITE_FUNCTION_TRIGGER"]

    return res.json(data: [
        "message": "Hello from Appwrite!",
        "payload": payload,
        "secretKey": secretKey,
        "randomNumber": randomNumber,
        "trigger": trigger,
    ])
}