Environment variables in .env files

[bdube]

The example in README about using docker-compose config to check for unset variables implies that when using -f path/to/docker-compose.yml the .env file will be picked up from the directory of docker-compose.yml file. This does not appear to be the case.

Paths used with env_file entries within docker-compose.yml are taken to be relative to the project directory, but that does not seem to be the case for the way docker-compose looks for the default .env file.

This is unfortunate and makes working from the repository root directory more tedious without a script or alias helper.

[bdube]

Looks like this is bug docker/compose#7600