Dockerfile

ARG ELIXIR_VERSION=1.16.2
ARG OTP_VERSION=26.2.4
ARG UBUNTU_VERSION=jammy-20240227

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

FROM ${BUILDER_IMAGE} AS builder

# install build dependencies
RUN apt-get update \
    && \
    apt-get -y install \
            build-essential \
            git

# prepare build dir
WORKDIR /app

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

# set build ENV
ENV MIX_ENV="prod"

# install mix dependencies
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 lib lib

# Compile the 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} AS runner

RUN apt-get update \
    && \
    apt-get -y install \
            # required for HEALTHCHECK command
            curl \
    && \
    apt-get clean

WORKDIR "/app"
RUN chown nobody /app

# set runner ENV
ENV MIX_ENV="prod"

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

USER nobody

CMD ["/app/bin/server"]

HEALTHCHECK --interval=1m --timeout=5s --start-period=30s \
  CMD curl -f http://localhost:4001/api/health-check || exit 1