Add Docker files, Update rails commands

Dockerfile

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+FROM ruby:2.3
+
+RUN supercronicUrl=https://github.com/aptible/supercronic/releases/download/v0.1.3/supercronic-linux-amd64 && \
+    supercronicBin=/usr/local/bin/supercronic && \
+    supercronicSha1sum=96960ba3207756bb01e6892c978264e5362e117e && \
+    curl -fsSL -o "$supercronicBin" "$supercronicUrl" && \
+    echo "$supercronicSha1sum  $supercronicBin" | sha1sum -c - && \
+    chmod +x "$supercronicBin"
+
+ENV PORT=3000 \
+    RAILS_ENV=production \
+    RAILS_LOG_TO_STDOUT=true \
+    RAILS_SERVE_STATIC_FILES=true
+
+WORKDIR /usr/src/app
+
+COPY . ./
+
+# install dependencies, recognize database_url, generate crontab
+RUN echo 'gem: --no-document' >> ~/.gemrc && \
+    bundle config build.nokogiri "--use-system-libraries" && \
+    bundle install --deployment --without development test -j 4 && \
+    rm -Rf /var/lib/apt/lists/* /var/cache/apt/* ~/.gemrc ~/.bundle && \
+    \
+    echo "production:\n  url: <%= ENV['DATABASE_URL'] %>" >config/database.yml && \
+    bundle exec whenever >crontab
+
+# compile assets with temporary mysql server
+RUN export DATABASE_URL=mysql2://localhost/temp && \
+    export SECRET_TOKEN=thisisnotimportantnow && \
+    export DEBIAN_FRONTEND=noninteractive && \
+    apt-get update && \
+    apt-get install -y mysql-server && \
+    /etc/init.d/mysql start && \
+    rails db:setup assets:precompile && \
+    rm -Rf tmp/* && \
+    /etc/init.d/mysql stop && \
+    rm -Rf /run/mysqld /tmp/* /var/tmp/* /var/lib/mysql /var/log/mysql* && \
+    apt-get purge -y --auto-remove mysql-server && \
+    rm -Rf /var/lib/apt/lists/* /var/cache/apt/*
+
+# Make relevant dirs writable for app user
+RUN mkdir -p tmp supplier_assets && \
+    chown nobody tmp supplier_assets
+
+# Run app as unprivileged user
+USER nobody
+
+EXPOSE 3000
+
+# cleanup, and by default start web process from Procfile
+ENTRYPOINT ["./docker-entrypoint.sh"]
+CMD ["./proc-start", "web"]