WIP: Subkey docker image (#3183)

* WIP to release subkey im docker

* debug run with publishing

* debug build

* debug build 2

* easier sync

* fix the template

* fix typo

substrate/scripts/docker/substrate.Dockerfile

@@ -0,0 +1,45 @@
+FROM debian:stretch-slim
+
+# metadata
+ARG VCS_REF
+ARG BUILD_DATE
+
+LABEL io.parity.image.authors="devops-team@parity.io" \
+	io.parity.image.vendor="Parity Technologies" \
+	io.parity.image.title="parity/substrate" \
+	io.parity.image.description="Substrate: The platform for blockchain innovators." \
+	io.parity.image.source="https://github.com/paritytech/substrate/blob/${VCS_REF}/scripts/docker/Dockerfile" \
+	io.parity.image.revision="${VCS_REF}" \
+	io.parity.image.created="${BUILD_DATE}" \
+	io.parity.image.documentation="https://wiki.parity.io/Parity-Substrate"
+
+# show backtraces
+ENV RUST_BACKTRACE 1
+
+# install tools and dependencies
+RUN apt-get update && \
+	DEBIAN_FRONTEND=noninteractive apt-get upgrade -y && \
+	DEBIAN_FRONTEND=noninteractive apt-get install -y \
+		libssl1.1 \
+		ca-certificates \
+		curl && \
+# apt cleanup
+	apt-get autoremove -y && \
+	apt-get clean && \
+	find /var/lib/apt/lists/ -type f -not -name lock -delete; \
+# add user
+	useradd -m -u 1000 -U -s /bin/sh -d /substrate substrate
+
+# add substrate binary to docker image
+COPY ./substrate /usr/local/bin
+
+USER substrate
+
+# check if executable works in this container
+RUN /usr/local/bin/substrate --version
+
+EXPOSE 30333 9933 9944
+VOLUME ["/substrate"]
+
+ENTRYPOINT ["/usr/local/bin/substrate"]
+