title: How to pass multiple environment variables in Dockerfile?
body: <p>I have a docker-compose file that allows me to pass the environment variables as a file (.env file). As I have multiple ENV variables, Is there any option in Dockerfile like env_file in docker-compose for passing multiple environment variables during docker build?</p>
  
  <p>This is the docker-compose.yml</p>
  
  <pre><code>services:
    web:
      image: "node"
      links:
          - "db"
      env_file: "env.app"
  </code></pre>