# start with fat build image
FROM teamon/alpine-asdf-pre:3.6 as build

# prepare build dir
RUN mkdir /app
WORKDIR /app

# install & cache tool dependencies
ADD .tool-versions ./
RUN asdf-pre install

# install & cache app dependencies
ENV MIX_ENV=prod
COPY mix.exs mix.lock ./
RUN mix do deps.get, deps.compile

ADD package.json package-lock.json ./
RUN npm install

# build release
COPY . .
RUN npm run build
RUN mix phx.digest
RUN mix release --verbose

# remove unnecessary files
RUN rm -rf _build/prod/rel/myapp/releases/*/*.tar.gz



# prepare tiny release image
FROM alpine:3.6
RUN apk add --update bash ca-certificates openssl

RUN mkdir /app && chown -R nobody: /app
WORKDIR /app
USER nobody

COPY --from=build /app/_build/prod/rel/myapp ./

ENV REPLACE_OS_VARS=true
EXPOSE 4000

ENTRYPOINT ["/app/bin/myapp"]