Sail local command for laravel with php 8.1. Add `sail init`, allowing the first download of `vendor` folder (without it you can't run sail)

sail

#!/usr/bin/env bash

cd "$(dirname "${BASH_SOURCE[0]}")"

#if the command is called with `init` param, or `vendor` folder is missing
if [ "$1" = "init" ] || [ ! -d vendor ]; then
    #run laravel sail container to run `composer install`
    docker run --rm \
        -u "$(id -u):$(id -g)" \
        -v $(pwd):/var/www/html \
        -w /var/www/html \
        laravelsail/php81-composer:latest \
        composer install --ignore-platform-reqs
fi

if [ "$1" != "init" ]; then
    ./vendor/bin/sail $@
fi