instruction: Create a Dockerfile for configuration
output: ```dockerfile
  from a Docker-managed secret instead of being passed directly.
  NoteDocker secrets do not set environment variables directly. This was a
  conscious decision, because environment variables can unintentionally be leaked
  between containers (for instance, if you use --link).Use Secrets in Compose
  
  services:
   db:
   image: mysql:latest
   volumes:
   - db_data:/var/lib/mysql
   environment:
   MYSQL_ROOT_PASSWORD_FILE: /run/secrets/db_root_password
   MYSQL_DATABASE: wordpress
   MYSQL_USER: wordpress
   MYSQL_PASSWORD_FILE: /run/secrets/db_password
   secrets:
   - db_root_password
   - db_password
  
   wordpress:
   depends_on:
   - db
   image: wordpress:latest
   ports:
   - "8000:80"
   environment:
   WORDPRESS_DB_HOST: db:3306
   WORDPRESS_DB_USER: wordpress
   WORDPRESS_DB_PASSWORD_FILE: /run/secrets/db_password
   secrets:
   - db_password
  
  secrets:
   db_password:
   file: db_password.txt
   db_root_password:
   file: db_root_password.txt
  
  volumes:
   db_data:This example creates a simple WordPress site using two secrets in
  a Compose file.The top-level element secrets defines two secrets db_password and
  db_root_password.When deploying, Docker creates these two secrets and populates them with the
  content
  ```