.gitlab-ci.yml: update to include docker builds and publishing (#1209)

* .gitlab-ci.yml: update to include docker builds and publishing

* add Dockerfile for the ci

substrate/scripts/docker/Dockerfile

@@ -0,0 +1,29 @@
+FROM ubuntu:xenial
+LABEL maintainer "devops-team@parity.io"
+LABEL description="Substrate: The platform for blockchain innovators"
+
+RUN apt-get update && \
+    apt-get upgrade -y && \
+    DEBIAN_FRONTEND=noninteractive apt-get install -y \
+		libssl1.0.0 \
+		ca-certificates \
+		curl && \
+    apt-get autoremove -y && \
+    apt-get clean
+    
+RUN	find /var/lib/apt/lists/ -type f -not -name lock -delete
+
+COPY ./substrate /usr/local/bin
+
+
+
+RUN useradd -m -u 1000 -U -s /bin/sh -d /substrate substrate
+USER substrate
+
+ENV RUST_BACKTRACE 1
+
+EXPOSE 30333 9933 9944
+VOLUME ["/substrate"]
+
+ENTRYPOINT ["/usr/local/bin/substrate"]
+