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-20210902-slim - for the release image
#   - https://pkgs.org/ - resource for finding needed packages
#   - Ex: hexpm/elixir:1.13.2-erlang-22.3-debian-bullseye-20210902-slim
#
ARG ELIXIR_VERSION=1.14.5
ARG OTP_VERSION=26.0.1
ARG DEBIAN_VERSION=bullseye-20230522-slim

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

FROM ${BUILDER_IMAGE} as builder

# install build dependencies
RUN apt-get update -y \
  && apt-get install -y curl \
  && curl -fsSL https://deb.nodesource.com/setup_16.x | bash - \
  && apt-get install -y build-essential git nodejs \
  && apt-get clean \
  && rm -f /var/lib/apt/lists/*_*

# prepare build dir
WORKDIR /app

# install hex + rebar
RUN mix local.hex --force && \
  mix local.rebar --force

# set build ENV
ENV MIX_ENV="prod"
ARG BANCHAN_HOST
ARG BANCHAN_DEPLOY_ENV

# install mix dependencies
COPY mix.exs mix.lock ./
RUN --mount=type=secret,id=OBAN_KEY_FINGERPRINT \
    --mount=type=secret,id=OBAN_LICENSE_KEY \
    mix hex.repo add oban https://getoban.pro/repo \
      --fetch-public-key "$(cat /run/secrets/OBAN_KEY_FINGERPRINT)" \
      --auth-key "$(cat /run/secrets/OBAN_LICENSE_KEY)"
RUN mix deps.get --only $MIX_ENV
RUN mkdir config

# .git is used to calculate release version. Kinda overkill but eh.
COPY .git .git

# 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 lib lib

COPY assets assets

# Pre-compile the Surface hooks for assets.deploy
RUN mix compile

# compile assets
RUN mix assets.deploy

# Compile the actual release
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

# start a new build stage so that the final image will only contain
# the compiled release and other runtime necessities
FROM ${RUNNER_IMAGE}

RUN apt-get update -y && apt-get install -y curl libstdc++6 openssl libncurses5 locales imagemagick ffmpeg ca-certificates \
  && apt-get clean && rm -f /var/lib/apt/lists/*_*

# 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

RUN useradd -ms /bin/bash tteokbokki
WORKDIR "/app"
RUN chown tteokbokki /app

# set runner ENV
ENV MIX_ENV="prod"

# Only copy the final release from the build stage
COPY --from=builder --chown=tteokbokki:root /app/_build/${MIX_ENV}/rel/banchan ./

USER tteokbokki

# Install flyctl so we can run backups.
RUN curl -L https://fly.io/install.sh | sh

ENV FLYCTL_INSTALL "/home/tteokbokki/.fly"
ENV PATH "$FLYCTL_INSTALL/bin:$PATH"

RUN chmod +x /app/bin/*
CMD ["/app/bin/server"]
# Appended by flyctl
ENV ECTO_IPV6 true
ENV ERL_AFLAGS "-proto_dist inet6_tcp"