I ran docker-compose up and the 3 containers (laravel-web,-php and -database) were created and started.
Howerver, when I try to access the app (address http://localhost) via browser, the following appears:
Warning: require(/var/www/public/../vendor/autoload.php): failed to open stream: No such file or directory in /var/www/public/index.php on line 24
Fatal error: require(): Failed opening required '/var/www/public/../vendor/autoload.php'
In fact, I can't find that file nor the composer.phar on the laravel-web container.