Sample for phoenix(elixir)-postgres

Signed-off-by: Manolis Kousanakis <ekousanakis@gmail.com>

phoenix-postgres/app/Dockerfile

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+
+# ---- Build Stage ----
+FROM elixir:1.9-alpine AS app_builder
+
+# Set environment variables for building the application
+ENV MIX_ENV=prod
+ENV LANG=C.UTF-8
+
+# install build dependencies
+RUN apk add --update git build-base nodejs npm yarn python
+
+# Install hex and rebar
+RUN mix local.hex --force && \
+    mix local.rebar --force
+
+# Create the application build directory
+WORKDIR /app
+
+# install mix dependencies
+COPY mix.* ./
+COPY config config
+RUN mix deps.get \
+    && mix release.init \
+    && mix deps.compile --force --only $MIX_ENV 
+
+# build assets
+COPY assets assets
+COPY priv priv
+RUN cd assets \
+    && npm install \
+    && npm run deploy
+RUN mix phx.digest
+
+# build project and release
+COPY lib lib
+RUN mix compile \ 
+    && mix release
+
+# ---- Application Stage ----
+FROM alpine as app
+
+ENV MIX_ENV=prod
+ENV LANG=C.UTF-8
+
+# Install openssl
+RUN apk add --update openssl ncurses-libs
+
+# create a non root user
+RUN addgroup -S appgroup && adduser -S app_user -G appgroup
+
+WORKDIR /home/app_user
+
+# Copy over the build artifact from the previous step 
+COPY --from=app_builder /app/_build/${MIX_ENV}/rel .
+
+COPY entrypoint.sh .
+
+RUN chmod 755 entrypoint.sh
+
+RUN chown -R app_user: .
+
+USER app_user
+
+CMD ["sh", "entrypoint.sh"]