env_file support

[flaushi]

First of all: I love your tool!

I am converting docker-compose.yml to Dockerrun.aws.json. This has been working very well for almost 3 years now.

Recently I added for one service an env_file directive:

version: '2'

services:
    php:
        env_file:
            - /var/app/current/myenv

so, besides my docker-compose there is a file myenv that should be used as env file. During transfer to ECS, it will be stored in /var/app/current/myenv from where it could be used.

I am unsure if such an option exists in the Dockerrun format at all.

If not, theoretically it would be possible to transform each of the defined variables to

"containerDefinitions": [
    {
      "name": "php-app",
      "image": "php:fpm",
      "environment": [
        {
          "name": "var1",
          "value": "val1"
        },
        {
          "name": "var2",
          "value": "val2"
        }, ...
      ],

see the docs here

I would be very grateful for your help