Add docker file for Substrate (#930)

substrate/.dockerignore

+doc
+target

substrate/Dockerfile

+FROM phusion/baseimage:0.10.1 as builder
+LABEL maintainer "chevdor@gmail.com"
+LABEL description="This is the build stage for Substrate. Here we create the binary."
+
+ARG PROFILE=release
+WORKDIR /substrate
+
+COPY . /substrate
+
+RUN apt-get update && \
+	apt-get upgrade -y && \
+	apt-get install -y cmake pkg-config libssl-dev git
+
+RUN curl https://sh.rustup.rs -sSf | sh -s -- -y && \
+	export PATH=$PATH:$HOME/.cargo/bin && \
+	cargo build --$PROFILE
+
+# ===== SECOND STAGE ======
+
+FROM phusion/baseimage:0.10.0
+LABEL maintainer "chevdor@gmail.com"
+LABEL description="This is the 2nd stage: a very small image where we copy the Substrate binary."
+ARG PROFILE=release
+COPY --from=builder /substrate/target/$PROFILE/substrate /usr/local/bin
+
+RUN mv /usr/share/ca* /tmp && \
+	rm -rf /usr/share/*  && \
+	mv /tmp/ca-certificates /usr/share/ && \
+	rm -rf /usr/lib/python* && \
+	mkdir -p /root/.local/share/Substrate && \
+	ln -s /root/.local/share/Substrate /data
+
+RUN	rm -rf /usr/bin /usr/sbin
+
+EXPOSE 30333 9933 9944
+VOLUME ["/data"]
+
+CMD ["/usr/local/bin/substrate"]