Railway•3y ago

Access env variables inside Dockerfile

I'm trying to create a dockerfile which needs access to an env variable to properly build (its not needed for the app itself). I read that I could use the ARG command and pass the variable through docker --build-arg <ARG>, but this still doesn't seem to use the environment variables, as I still need to additionally pass it through the --build-arg flag (and I'm not sure if I can do that through railway). Am i missing something? I just wanted to do something like

# Clone the separate lists repo
ARG GIT_LISTS_HTTPS_REPO
RUN git clone $GIT_LISTS_HTTPS_REPO .

# Clone the separate lists repo
ARG GIT_LISTS_HTTPS_REPO
RUN git clone $GIT_LISTS_HTTPS_REPO .

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Access env variables inside Dockerfile