title: Strapi cms, where to put the environment variables?
body: <p>I am using stripe 3.0.0-beta.18.4 and there is a file <em>config/environments/development/database.json</em></p>
  
  <p>with this structure:</p>
  
  <pre><code>"settings": {
      "client": "mysql",
      "host": "${process.env.DATABASE_HOST || '127.0.0.1'}",
      "port": "${process.env.DATABASE_PORT || 27017}",
      "database": "${process.env.DATABASE_NAME || 'strapi'}",
      "username": "${process.env.DATABASE_USERNAME || ''}",
      "password": "${process.env.DATABASE_PASSWORD || ''}"
  },
  </code></pre>
  
  <p>however, I can not find where to set that DATA_HOST data, I tried to write DATABASE_HOST="mydb" in a created .env file in root, but it does not work, I would like to find where to put those environment variables to get them work with the process.env.</p>
  
  <p>Thanks in advance</p>