polkadot builds (gitlab), releases (docker) and deployment (kubernetes) (#48)

* ci: add Dockerfile and its build

* make docker version tag

* polkadot with static ip address in nodeport stateful set on kubernetes

* use helm for templating

* enable rbac for polkadot

polkadot/scripts/docker/Dockerfile

@@ -0,0 +1,29 @@
+FROM ubuntu:xenial
+LABEL maintainer "devops-team@parity.io"
+LABEL description="Paritytech Polkadot Node Implementation"
+
+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 ./polkadot /usr/local/bin
+
+
+
+RUN useradd -m -u 1000 -U -s /bin/sh -d /polkadot polkadot
+USER polkadot
+
+ENV RUST_BACKTRACE 1
+
+EXPOSE 30333 9933 9944
+VOLUME ["/polkadot"]
+
+ENTRYPOINT ["/usr/local/bin/polkadot"]
+