Scaffold Symfony 8 app with Bootstrap/DataTables and Docker stack

- Symfony 8.1 webapp skeleton on PHP 8.5 (AssetMapper/importmap, no Node)
- Form-login gate: User entity, security.yaml, SecurityController,
  app:user:create command, initial migration (user + messenger_messages)
- Bootstrap 5 + DataTables layout (base/login/home templates); any
  table.datatable is auto-initialised
- trusted_proxies/headers wired for the shared Nginx Proxy Manager
- Docker (servers only): docker-compose.yml (php:8.5-fpm-alpine,
  nginx:1.30-alpine, mariadb:12.3; host ports 8085/3310; external
  docker_default network) + docker/{Dockerfile,php.ini,nginx,setup.sh,restart.sh}
- .env with CHANGEME placeholders (no secrets), .gitattributes enforces
  LF so the deploy scripts stay runnable on Linux

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

docker/php/Dockerfile

@@ -0,0 +1,43 @@
+FROM php:8.5-fpm-alpine
+
+RUN apk add --no-cache \
+        bash \
+        git \
+        icu-dev \
+        libzip-dev \
+        zip \
+        unzip \
+        $PHPIZE_DEPS \
+    && docker-php-ext-configure intl \
+    && docker-php-ext-install -j"$(nproc)" \
+        intl \
+        pdo_mysql \
+        opcache \
+        zip \
+    && apk del $PHPIZE_DEPS
+
+COPY --from=composer:2 /usr/bin/composer /usr/bin/composer
+
+COPY docker/php/php.ini /usr/local/etc/php/conf.d/app.ini
+
+WORKDIR /var/www/html
+
+COPY composer.json composer.lock symfony.lock ./
+RUN composer install --no-interaction --no-scripts --no-autoloader --prefer-dist
+
+COPY . .
+RUN composer dump-autoload --optimize --classmap-authoritative
+
+# var/ is a .dockerignore'd host concern and gets a named volume mounted over it
+# at runtime; create + own it so php-fpm (www-data) can write cache/logs/sessions.
+RUN mkdir -p var && chown -R www-data:www-data var
+
+# /var/www/html is bind-mounted from the host at runtime, owned by whoever
+# deployed it - keep git from refusing to touch it.
+RUN git config --system --add safe.directory /var/www/html
+
+USER www-data
+
+EXPOSE 9000
+
+CMD ["php-fpm"]

docker/php/php.ini

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+; dmtools - PHP-FPM runtime tuning (servers).
+
+expose_php = Off
+memory_limit = 256M
+max_execution_time = 60
+date.timezone = Europe/Amsterdam
+
+upload_max_filesize = 20M
+post_max_size = 21M
+
+realpath_cache_size = 4096K
+realpath_cache_ttl = 600
+
+opcache.enable = 1
+opcache.enable_cli = 0
+opcache.memory_consumption = 128
+opcache.max_accelerated_files = 20000
+opcache.validate_timestamps = 0
+opcache.preload_user = www-data
+opcache.preload = /var/www/html/config/preload.php