laravel 8, curl & sail

two questions: 1) How can i use curl to install laravel 8? eg: "curl -s "https://laravel.build/example-app?version=8.*" | bash"

after installing laravel 8 with composer, the "./vendor/bin/sail up" is not working. but the documentations says that sail is automatically installed, what do i miss? the error is:

no configuration file provided: not found
no configuration file provided: not found