Dockerfile

# Debugging Notes:
#
#   docker run -it --rm tictac /bin/ash
FROM hexpm/elixir:1.12.1-erlang-24.0.1-alpine-3.13.3 AS build

# install build dependencies
RUN apk add --no-cache build-base npm

# prepare build dir
WORKDIR /app

# extend hex timeout
ENV HEX_HTTP_TIMEOUT=20

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

# set build ENV
ENV MIX_ENV=prod
ENV SECRET_KEY_BASE=nokey

# install mix dependencies
COPY mix.exs mix.lock ./
COPY config config

RUN mix deps.get --only prod && \
    mix deps.compile

# install npm dependencies
COPY assets/package.json assets/package-lock.json ./assets/
RUN npm --prefix ./assets ci --progress=false --no-audit --loglevel=error

COPY priv priv
COPY assets assets

# NOTE: We are using TailwindCSS, it uses a special "purge" step and that
# requires the code in `lib` to see what is being used.
COPY lib lib
# build assets
RUN npm run --prefix ./assets deploy
RUN mix phx.digest

# compile and build release
COPY rel rel
RUN mix release

# prepare release image
FROM alpine:3.13.3 AS app
RUN apk add --no-cache libstdc++ openssl ncurses-libs

WORKDIR /app

RUN chown nobody:nobody /app

USER nobody:nobody

COPY --from=build --chown=nobody:nobody /app/_build/prod/rel/tictac ./

ENV HOME=/app
ENV MIX_ENV=prod
ENV SECRET_KEY_BASE=nokey
ENV PORT=4000

CMD ["bin/tictac", "start"]