title: Docker-compose not reading environment variables (MYSQL_DATABASE_PASSWORD)
body: <p>I'm attempting to use Portainer's default Wordpress template to build a little wordpress stack, on a Synology NAS. It outright declares MYSQL_DATABASE_PASSWORD, but on run, I get the following:</p>
  
  <p><code>You need to specify one of MYSQL_ROOT_PASSWORD, MYSQL_ALLOW_EMPTY_PASSWORD and MYSQL_RANDOM_ROOT_PASSWORD</code></p>
  
  <p>I've tried the same for <a href="https://docs.filerun.com/docker" rel="nofollow noreferrer">FileRun</a> using their default docker-compose.yml file in their documentation, and even that throws the above error.</p>
  
  <p>I've tried exporting any/all of those environment variables, but have found the same issue occurs.</p>
  
  <pre><code>version: '2'
  
  services:
    db:
      image: mariadb:10.1
      environment:
        MYSQL_ROOT_PASSWORD: your_mysql_root_password
        MYSQL_USER: your_filerun_username
        MYSQL_PASSWORD: your_filerun_password
        MYSQL_DATABASE: your_filerun_database
      volumes:
        - /filerun/db:/var/lib/mysql
  
    web:
      image: afian/filerun
      environment:
        FR_DB_HOST: db
        FR_DB_PORT: 3306
        FR_DB_NAME: your_filerun_database
        FR_DB_USER: your_filerun_username
        FR_DB_PASS: your_filerun_password
        APACHE_RUN_USER: www-data
        APACHE_RUN_USER_ID: 33
        APACHE_RUN_GROUP: www-data
        APACHE_RUN_GROUP_ID: 33
      depends_on:
        - db
      links:
        - db:db
      ports:
        - "80:80"
      volumes:
        - /filerun/html:/var/www/html
        - /filerun/user-files:/user-files
  </code></pre>
  
  <p>Expected results would be the stack runs, specifically the mariadb container. What actually happens is the container dies, repeatedly, throwing the <code>You need to specify one of MYSQL_ROOT_PASSWORD, MYSQL_ALLOW_EMPTY_PASSWORD and MYSQL_RANDOM_ROOT_PASSWORD</code> error.</p>