dockerfile:

Stage 1: Build the application

FROM hexpm/elixir:1.12.2-erlang-24.0.2-alpine-3.13.3 AS build

Set environment variables

ENV MIX_ENV=prod
ENV LANG=C.UTF-8

Install Hex + Rebar

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

Install build dependencies

RUN apk update && apk add --no-cache \
build-base \
git \
npm \
curl \
bash \
openssl

Set build directory

WORKDIR /app

Cache Elixir dependencies

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

Copy the rest of the application code

COPY . .

Install npm dependencies and build assets (if any)

Comment out if you don't have assets

RUN cd assets && npm install && npm run deploy

RUN mix phx.digest

Compile the application

RUN mix compile

Build the release

RUN mix release

Stage 2: Create the runtime image

FROM alpine:3.13.3 AS app

Install runtime dependencies

RUN apk add --no-cache \
bash \
openssl \
ncurses-libs

Set work directory

WORKDIR /app

Copy the release from the build stage

COPY --from=build /app/build/prod/rel/myapi ./

Expose the port the app runs on

EXPOSE 4000

Start the application

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

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