Dockerfile

################################################################################
# Build Image
FROM elixir:1.15-slim as build
LABEL maintainer "Christophe De Troyer <christophe@call-cc.be>"

# Install compile-time dependencies
ENV DEBIAN_FRONTEND=noninteractive 
RUN apt-get update && apt-get install -y git nodejs npm yarn python3
RUN mkdir /app 
WORKDIR /app 

# Install Hex and Rebar 
RUN mix do local.hex --force, local.rebar --force

# set build ENV
ENV MIX_ENV=prod

# install mix dependencies
COPY mix.exs mix.lock ./
COPY config config
RUN mix deps.get --only $MIX_ENV
RUN mix deps.compile

# Build web assets.
COPY assets assets
RUN npm install --prefix ./assets && npm run deploy --prefix ./assets
RUN mix phx.digest

# Compile entire project.
COPY priv priv
COPY lib lib
COPY rel rel 
RUN mix compile

# Build the entire release.
RUN mix release

################################################################################
# Release Image

FROM elixir:1.15-slim AS app

RUN apt-get update && DEBIAN_FRONTEND=noninteractive apt-get install -y openssl postgresql-client locales

# Set the locale
# Set the locale
RUN sed -i '/en_US.UTF-8/s/^# //g' /etc/locale.gen && \
    locale-gen
ENV LANG en_US.UTF-8  
ENV LANGUAGE en_US:en  
ENV LC_ALL en_US.UTF-8     

ENV MIX_ENV=prod

# Make the working directory for the application.
RUN mkdir /app
WORKDIR /app

# Copy release from build container to this container.
COPY --from=build /app/_build/prod/rel/ .
COPY entrypoint.sh .
RUN chown -R nobody: /app
USER nobody

ENV HOME=/app
CMD /bin/bash /app/entrypoint.sh