index.community/backend/Dockerfile

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Docker
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FROM elixir:1.9.0-alpine as build
# install build dependencies
RUN apk add --update git build-base
# prepare build dir
RUN mkdir /app
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 ./
COPY config config
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RUN mix deps.get
RUN mix deps.compile
# build assets
# COPY assets assets
# RUN cd assets && npm install && npm run deploy
# RUN mix phx.digest
# build project
COPY priv priv
COPY lib lib
RUN mix compile
# build release
COPY rel rel
RUN mix release
# prepare release image
FROM alpine:3.9 AS app
RUN apk add --update bash openssl
RUN mkdir /app
WORKDIR /app
ENV APP_NAME=backend
COPY --from=build /app/_build/prod/rel/${APP_NAME} ./
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COPY Procfile ./
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RUN chown -R nobody: /app
USER nobody
ENV HOME=/app
# The command to start the backend
CMD trap 'exit' INT; ${HOME}/bin/${APP_NAME} start