The files you're looking for are already on your system: Copy files codes to the same files in docker, and restart system and docker
/etc/ssl/certs/ssl-cert-snakeoil.pem /etc/ssl/private/ssl-cert-snakeoil.key
open laravel page and set checkbox
Advanced:
If for some reason you need to create a fresh certificate, you can run sudo make-ssl-cert generate-default-snakeoil --force-overwrite