Ability to configure server using environment variables

[lisfox1]

When running this service inside a docker container it would be handy to be able to configure it using env vars instead of cli parameters.

[tustvold]

This would be especially useful when using Github Actions which for some inexplicable reason do not support passing command line arguments to services - https://github.com/orgs/community/discussions/26688

[mikechernev]

@fsouza mind if I pick up this issue?

[fsouza]

@fsouza mind if I pick up this issue?

Go for it!

[onarres]

I created my own docker wrapping the original so I could pass environment variables:

ARG VERSION=1.47.4

# https://github.com/fsouza/fake-gcs-server
FROM fsouza/fake-gcs-server:$VERSION

ENV GCS_SCHEME="http"
ENV GCS_PORT=9010
ENV GCS_URL="http://localhost"

EXPOSE $GCS_PORT

#Remove the original ENTRYPOINT ["/bin/fake-gcs-server", "-data", "/data"] so we can use variables on the CMD and they get interpreted correctly
ENTRYPOINT []

CMD /bin/fake-gcs-server -data "/data" -scheme $GCS_SCHEME -port $GCS_PORT -external-url "$GCS_URL:$GCS_PORT"

I don't know how to add anything to the main repo to easily add this functionality other than creating a separate docker image that supports this.