Possible to pass env variable from docker-compose.yml to dockerfile?

Question

Is it possible to pass an env from an docker-compose.yml file to dockerfile.

I have inside the dockerfile like this:

RUN $(npm bin)/ng build --prod --env=prod

But what I want is when the docker-compose.yml has a build_env that is:

environment:
            BUILD_ENV: 'test'

Then I want the docker

RUN $(npm bin)/ng build --prod --env=test

How do I achieve something like this? Or are there any other better solutions to do this?

Answer 1

You can review this documentation:

https://docs.docker.com/compose/compose-file/#args

build:
  context: .
  args:
    - buildno=1
    - password=secret
    - buildenv=prod

-

ARG buildno
ARG password
ARG buildenv

RUN echo "Build number: $buildno"
RUN script-requiring-password.sh "$password"
RUN $(npm bin)/ng build --prod --env="$buildenv"