version: '3'
services:
  app:
    build:
      context: .
      dockerfile: docker/Dockerfile
    environment:
      EMAIL_FROM:    no-reply@example.com
      EMAIL_TO:      me@example.com
      EMAIL_SUBJECT: "Daily mail for YYYYYY"
      TRELLO_URL:    https://trello.com/b/xxxxx/yyyy
      TRELLO_TOKEN:  xxxxxxxxxxxxxx
      SMTP_HOSTNAME: smtp.example.com
      SMTP_USERNAME: foobar@example.com
      SMTP_PASSWORD: securefoobar
      SMTP_PORT:   587
      # SMTP_AUTH_TYPE accepts either "none", "plain" or "login"
      SMTP_AUTH_TYPE: plain 
      # SMTP_SECURITY_TYPE accepts either "none", "tls" or "starttls"
      SMTP_SECURITY_TYPE: tls