Feature Request: Pass environment variables as CLI arguments when executing a docker build

[gnz00]

If you have any tasks inside your Dockerfile that require environment variables specified in the docker-compose file, they will not be found. An easy solution would be to have environment variables passed in as arguments to the docker build command, i.e.

docker-compose.yml

dev:
  build: .
  environment:
    - RACK_ENV=development
    - SESSION_SECRET=12345

As executed by docker-compose:
docker build . -eRACK_ENV=development -eSESSION_SECRET=12345

[aanand]

docker build doesn't support a -e flag, or any means of passing environment variables in to the build. This functionality would have to be supported by the Docker engine first.

It's been discussed a lot - for example, here's a recent proposal: moby/moby#15182

[CyborTronik]

Does it make sense to reopen this issue? as for docker was implemented?