feat: add basic Docker configuration for backend and frontend services

docker/.gitignore

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+.Caddyfile
+
+caddy-data/
+
+caddy-config/
+
+mariadb_data/

docker/Caddyfile

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+# Leave this section
+{
+  admin off
+}
+
+http://localhost {
+  root * /app/public
+
+  encode zstd gzip
+  php_fastcgi php-fpm:9000
+
+  @laravel_not_found {
+      not file
+      not path /index.php*
+  }
+  rewrite @laravel_not_found /index.php
+
+  file_server
+}
+
+# Leave this section
+http://localhost:2019 {
+  metrics /metrics
+}

docker/docker-compose.yml

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+services:
+  node:
+    container_name: node
+    build:
+      context: ../frontend
+      dockerfile: Dockerfile
+    restart: unless-stopped
+    depends_on:
+      php-fpm:
+        condition: service_healthy
+    healthcheck:
+      test: ["CMD", "wget", "--no-verbose", "--tries=1", "--spider", "http://localhost"]
+      start_period: 10s
+      interval: 1m
+      timeout: 5s
+      retries: 5
+
+  # Caddy webserver
+  caddy:
+    container_name: caddy
+    image: caddy:2.10.0-alpine
+    restart: unless-stopped
+    ports:
+      - 80:80 # Needed for HTTP->HTTPS redirection
+      - 443:443
+      - 443:443/udp
+    volumes:
+      # Caddy routes files (read-only)
+      - ./Caddyfile:/etc/caddy/Caddyfile:ro
+
+      # Caddy certificates and other temporary data
+      - ./caddy-data:/data
+
+      # Caddy configuration
+      - ./caddy-config:/config
+    depends_on:
+      - php-fpm
+    healthcheck:
+      test: ["CMD", "wget", "--no-verbose", "--tries=1", "--spider", "http://localhost:2019/metrics"]
+      start_period: 10s
+      interval: 1m
+      timeout: 5s
+      retries: 5
+
+  # Custom PHP container
+  php-fpm:
+    container_name: php-fpm
+    user: 'www-data:www-data'
+    build:
+      context: ../backend
+      dockerfile: Dockerfile
+    restart: unless-stopped
+    env_file:
+      - ../backend/.env
+    depends_on:
+      database:
+        condition: service_healthy
+    healthcheck:
+      test: ["CMD", "pgrep", "-x", "php-fpm"]
+      start_period: 10s
+      interval: 1m
+      timeout: 5s
+      retries: 5
+
+  # MariaDB database
+  # No ports are open, only Shopware itself has access
+  database:
+    container_name: mariadb
+    image: mariadb:11.8.2-noble
+    restart: unless-stopped
+    cap_add:
+      # Allow memory binding
+      - SYS_NICE
+    environment:
+      # Change these if needed
+      MARIADB_DATABASE: "isop"
+      MARIADB_ROOT_PASSWORD: "admin"
+    volumes:
+      # Database data
+      - ./mariadb_data:/var/lib/mysql
+    healthcheck:
+      test: [ "CMD", "healthcheck.sh", "--su-mysql", "--connect", "--innodb_initialized" ]
+      start_period: 10s
+      interval: 1m
+      timeout: 5s
+      retries: 3