ci: restore docker files

scripts/docker/hub/Dockerfile

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+FROM ubuntu:xenial
+MAINTAINER Parity Technologies <devops@parity.io>
+#set ENVIROMENT
+ARG TARGET
+ENV TARGET ${TARGET}
+
+# install tools and dependencies
+RUN apt update && apt install -y --no-install-recommends openssl libudev-dev file
+
+# show backtraces
+ENV RUST_BACKTRACE 1
+
+#cleanup Docker image
+RUN apt autoremove -y
+RUN apt clean -y
+RUN rm -rf /tmp/* /var/tmp/* /var/lib/apt/lists/*
+
+#add TARGET to docker image
+COPY artifacts/x86_64-unknown-linux-gnu/$TARGET /usr/bin/$TARGET
+
+# Build a shell script because the ENTRYPOINT command doesn't like using ENV
+RUN echo "#!/bin/bash \n ${TARGET} \$@" > ./entrypoint.sh
+RUN chmod +x ./entrypoint.sh
+
+# setup ENTRYPOINT
+EXPOSE 5001 8080 8082 8083 8545 8546 8180 30303/tcp 30303/udp
+ENTRYPOINT ["./entrypoint.sh"]