Hello, I think you should not use Sail for production, the docs state

Laravel Sail is a light-weight command-line interface for interacting with Laravel's default Docker development environment.

But if you want to have let's encrypt there are many ways, you can use a container to manage the certificates provision and renewal which can get pretty complicated.

Here is some information about doing it with docker

https://medium.com/@pentacent/nginx-and-lets-encrypt-with-docker-in-less-than-5-minutes-b4b8a60d3a71

My suggestion, do not use Laravel Sail for production, instead build an image for the project and deploy a docker container in a container service like AWS ECS or similar, but again this will depend a lot on your needs for the production environment. You should also evaluate it in your context (Internal tool, public website ETC).