Add Dockerfile

.dockerignore

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+_build
+deps
+assets/node_modules
+assets/elm-stuff
+test

Dockerfile

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+FROM elixir:1.10.3-alpine AS app_builder
+
+ENV MIX_ENV=prod \
+    SECRET_KEY_BASE=secret-key-that-should-be-overriden-on-build
+
+RUN apk add --update nodejs nodejs-npm \
+    && mix local.hex --force \
+    && mix local.rebar --force
+
+COPY . /app
+WORKDIR /app
+
+RUN mix deps.get --only prod \
+    && mix compile \
+    && npm install --prefix ./assets \
+    && npm run deploy --prefix ./assets \
+    && mix phx.digest \
+    && mix release
+
+FROM alpine as app
+
+EXPOSE 4000
+
+RUN apk add --update openssl ncurses-libs \
+    && rm -rf /var/cache/apk/*
+
+RUN adduser -D -h /home/app app
+WORKDIR /home/app
+COPY --from=app_builder /app/_build/prod/rel/planningpoker .
+RUN chown -R app: .
+USER app
+
+CMD ["bin/planningpoker", "start"]