Allow release and Docker multiarch building

Signed-off-by: Thomas Citharel <tcit@tcit.fr>

docker/multiarch/Dockerfile

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+FROM elixir as build
+SHELL ["/bin/bash", "-c"]
+ENV MIX_ENV prod
+# ENV LANG en_US.UTF-8
+ARG APP_ASSET
+
+# Set the right versions
+ENV ELIXIR_VERSION latest
+ENV ERLANG_VERSION latest
+ENV NODE_VERSION 16
+
+# Install system dependencies
+RUN apt-get update -yq && apt-get install -yq build-essential cmake postgresql-client git curl gnupg unzip exiftool webp imagemagick gifsicle
+RUN apt-get clean && rm -rf /var/lib/apt/lists/* /tmp/* /var/tmp/*
+
+# # Install Node & yarn
+# RUN curl -sL https://deb.nodesource.com/setup_16.x | bash && apt-get install nodejs -yq
+# RUN npm install -g yarn
+
+# Install build tools
+RUN source /root/.bashrc && \
+    mix local.rebar --force && \
+    mix local.hex -if-missing --force
+
+RUN mkdir /mobilizon
+COPY ./ /mobilizon
+WORKDIR /mobilizon
+
+# # Build front-end
+# RUN yarn --cwd "js" install --frozen-lockfile
+# RUN yarn --cwd "js" run build
+
+# Elixir release
+RUN source /root/.bashrc && \
+    mix deps.get --only prod && \
+    mix compile  && \
+    mix phx.digest.clean --all && \
+    mix release --path release/mobilizon && \
+    cd release/mobilizon && \
+    ln -s lib/mobilizon-*/priv priv && \
+    cd ../../
+
+# Make a release archive
+RUN tar -zcf /mobilizon/${APP_ASSET} -C release mobilizon

docker/multiarch/README.md

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+Contains the Dockerfile used to generate multi-arch Elixir releases