my Elixir Dockerfile

## Workflow from the command line is something like:
## $ mix edeliver build release --tag=1.2.3
## $ sudo docker build -t myapp --build-arg VERSION=1.2.3

FROM ubuntu:16.04

RUN apt-get update -y && \
    apt-get install -y openssl postgresql-client

RUN mkdir -p /app

ARG VERSION=0.0.1

COPY .deliver/releases/api_${VERSION}.release.tar.gz /app/myapp.tar.gz

WORKDIR /app

RUN tar xfz myapp.tar.gz

RUN openssl req -x509 -newkey rsa:4096 -keyout key.pem -out cert.pem -days 365 \
      -nodes -subj "/C=US/ST=Massachusetts/L=Boston/O=Appcues/OU=Eng/CN=myapp.example.com"
# These vars are used in config/prod.exs
ENV MYAPP_SSL_CERT_PATH /app/cert.pem
ENV MYAPP_SSL_KEY_PATH /app/key.pem
ENV MYAPP_SSL_PORT 4443

ENV LANG en_US.UTF-8
ENV LANGUAGE en_US.UTF-8
ENV LC_ALL en_US.UTF-8
ENV LC_CTYPE en_US.UTF-8
ENV LC_NUMERIC en_US.UTF-8
ENV LC_TIME en_US.UTF-8
ENV LC_COLLATE en_US.UTF-8
ENV LC_MONETARY en_US.UTF-8
ENV LC_MESSAGES en_US.UTF-8
ENV LC_PAPER en_US.UTF-8
ENV LC_NAME en_US.UTF-8
ENV LC_ADDRESS en_US.UTF-8
ENV LC_TELEPHONE en_US.UTF-8
ENV LC_MEASUREMENT en_US.UTF-8
ENV LC_IDENTIFICATION en_US.UTF-8
ENV TZ UTC

CMD ["/app/bin/myapp", "foreground"]