fix: generate APP_KEY manually (Lumen has no key:generate)

.drone.yml

@@ -32,7 +32,7 @@ steps:
       - apt-get install -y --no-install-recommends libzip-dev libpng-dev libxml2-dev libonig-dev > /dev/null 2>&1
       - docker-php-ext-install pdo pdo_mysql zip mbstring > /dev/null 2>&1
       - cp .env.example .env
-      - php artisan key:generate
+      - APP_KEY=$(php -r "echo 'base64:'.base64_encode(random_bytes(32));") && sed -i "s|APP_KEY=.*|APP_KEY=${APP_KEY}|" .env
       - vendor/bin/phpunit --no-coverage --stop-on-failure
     environment:
       DB_CONNECTION: sqlite