initial docker setup for bump

bump/Dockerfile

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+# Elixir + Phoenix
+
+FROM elixir:1.12.2
+
+# Install debian packages
+RUN apt-get update
+RUN apt-get install --yes build-essential inotify-tools postgresql-client
+
+# Install Phoenix packages
+RUN mix local.hex --force
+RUN mix local.rebar --force
+RUN mix archive.install hex phx_new --force
+
+COPY setup.sh /usr/local/bin/
+EXPOSE 4012
+ENTRYPOINT ["setup.sh"]