Dockerfile Elixir phoenix

Dockerfile

FROM alpine

RUN echo 'http://dl-4.alpinelinux.org/alpine/edge/main' > /etc/apk/repositories && \
    echo 'http://dl-4.alpinelinux.org/alpine/edge/community' >> /etc/apk/repositories && \
    apk add --update elixir gettext-dev erlang-crypto nodejs && \
    rm -rf /var/cache/apk

RUN adduser -D -h /app app

USER app
COPY . /app

WORKDIR /app
RUN mix local.hex --force && \
    mix deps.get && \
    npm install

CMD ["mix", "phoenix.server"]