Verbose mode

When for whatever reason an error keeps occurring and needs some back and forth, it's a bit inconvenient to run the curl command, copy the log location, and tail it repeatedly. It would be nice if we had an environment variable to make the script print everything it writes in logs, directly to stdout.

Also when it is retrying to fetch a url, it may take a few minutes until the process finishes and prints the location of the log file, while if it printed the errors in stdout simultaneously (when the environment variable is set) one could immediately see it is a network error and act, saving time.

El issue no menciona archivos, pruebas ni puntos de entrada. Empieza localizando el código de logging y reintento de URL del instalador; después, sigue cómo la salida del log llega al archivo y cuándo se muestra la ubicación del log. Se considera terminado cuando un modo detallado controlado por una variable de entorno refleja los errores del log en stdout durante los reintentos sin cambiar la salida normal.