Dockerfile

# Find eligible builder and runner images on Docker Hub. We use Ubuntu/Debian
# instead of Alpine to avoid DNS resolution issues in production.
#
# https://hub.docker.com/r/hexpm/elixir/tags?page=1&name=ubuntu
# https://hub.docker.com/_/ubuntu?tab=tags
#
# This file is based on these images:
#
#   - https://hub.docker.com/r/hexpm/elixir/tags - for the build image
#   - https://hub.docker.com/_/debian?tab=tags&page=1&name=bullseye-20250317-slim - for the release image
#   - Ex: hexpm/elixir:1.18.3-erlang-26.0.2-debian-bullseye-20250317-slim

ARG ELIXIR_VERSION=1.18.3
ARG OTP_VERSION=26.0.2
ARG UBUNTU_VERSION=jammy-20250126

ARG BUILDER_IMAGE="hexpm/elixir:${ELIXIR_VERSION}-erlang-${OTP_VERSION}-ubuntu-${UBUNTU_VERSION}"
ARG RUNNER_IMAGE="ubuntu:${UBUNTU_VERSION}"

FROM ${BUILDER_IMAGE} AS builder

RUN apt-get update -y && apt-get install -y build-essential git npm \
    && apt-get clean && rm -f /var/lib/apt/lists/*_*

WORKDIR /app

RUN mix local.hex --force && \
    mix local.rebar --force

ENV MIX_ENV="prod"

COPY mix.exs mix.lock ./
RUN mix deps.get --only $MIX_ENV
RUN mkdir config

# Copy compile-time config files before we compile dependencies
# to ensure any relevant config change will trigger the dependencies
# to be re-compiled.
COPY config/config.exs config/${MIX_ENV}.exs config/
RUN mix deps.compile

COPY priv priv
COPY assets assets
RUN npm i --prefix assets

COPY lib lib

RUN mix assets.deploy
RUN mix compile

# Changes to config/runtime.exs don't require recompiling the code.
COPY config/runtime.exs config/

COPY rel rel
RUN mix release

FROM ${RUNNER_IMAGE}

RUN apt-get update -y && \
  apt-get install -y libstdc++6 openssl libncurses6 locales ca-certificates tzdata wget curl gnupg \
  && apt-get clean && rm -f /var/lib/apt/lists/*_*

RUN wget -q -O - https://dl-ssl.google.com/linux/linux_signing_key.pub | apt-key add -
RUN sh -c 'echo "deb [arch=amd64] http://dl.google.com/linux/chrome/deb/ stable main" >> /etc/apt/sources.list.d/google-chrome.list'
RUN apt-get -y update
RUN apt-get install -y google-chrome-stable

RUN apt-get install -yqq unzip
RUN wget -O /tmp/chromedriver.zip https://storage.googleapis.com/chrome-for-testing-public/134.0.6998.165/linux64/chromedriver-linux64.zip
RUN unzip /tmp/chromedriver.zip -d /tmp
RUN mv /tmp/chromedriver-linux64/chromedriver /usr/local/bin/

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"

WORKDIR "/app"
RUN chown nobody /app

ENV MIX_ENV="prod"

# Only copy the final release from the build stage.
COPY --from=builder --chown=nobody:root /app/_build/${MIX_ENV}/rel/vik ./

USER nobody

CMD ["/app/bin/server"]