'Is it possible to use an environment file in a Dockerfile?

Hey I need to split a docker compose file into Dockerfiles. I have multiple repositories that share environment files like some_file.env:

VARIABLE_1 = some_value
VARIABLE_2 = another_value
...

In docker compose I load those files with:

    env_file:
      - some_file.env

But is there a way to do this in a Dockerfile? I know I could do:

ENV VARIABLE_1 = some_value
ENV VARIABLE_2 = antoher_value

But I want the Dockerfiles to be affected when the submodules update without needing to change 3 Dockerfiles.

docker dockerfile

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