Fix docs

Author: daniel-cintra

DOCKER-SAIL.md

@@ -23,6 +23,17 @@ docker run --rm \
  composer install
 ```
 
+# Sail scaffolding install
+
+```bash
+docker run --rm \
+ -u "$(id -u):$(id -g)" \
+ -v "$(pwd):/var/www/html" \
+ -w /var/www/html \
+ laravelsail/php84-composer:latest \
+ php artisan sail:install
+```
+
 # Start sail
 
 ```bash