new builder image for the staking-miner

docker/README.md

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+# Self built Docker image
+
+The Polkadot repo contains several options to build Docker images for Polkadot.
+This folder contains a self-contained image that does not require a linux pre-built binary.
+Instead, building the image is possible on any host having docker installed and will
+build Polkadot inside Docker. That also means that no Rust toolchain is required on the host
+machine for the build to suceed.

scripts/docker/staking-miner/staking_miner-builder.Dockerfile

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+FROM paritytech/ci-linux:production as builder
+LABEL description="This is the build stage for Polkadot. Here we create the binary."
+
+ARG PROFILE=release
+WORKDIR /polkadot
+
+COPY . /polkadot
+
+RUN cargo build --locked --$PROFILE --package staking-miner
+
+# ===== SECOND STAGE ======
+
+FROM debian:buster-slim
+LABEL description="This is the 2nd stage: a very small image where we copy the Polkadot binary."
+ARG PROFILE=release
+COPY --from=builder /polkadot/target/$PROFILE/staking-miner /usr/local/bin
+
+RUN useradd -m -u 1000 -U -s /bin/sh miner && \
+	rm -rf /usr/bin /usr/sbin
+
+USER miner
+
+ENTRYPOINT [ "/usr/local/bin/staking-miner"]