feat: add dockerfile (#3)

Co-authored-by: Frank Bell <[email protected]>

.dockerignore

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+.git
+**/target/
+**/*.txt
+**/*.md
+/docker/
+
+# dotfiles in the repo root
+/.*

Dockerfile

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+# This file is sourced from https://github.com/paritytech/polkadot-sdk/blob/master/docker/dockerfiles/polkadot/polkadot_builder.Dockerfile
+FROM docker.io/paritytech/ci-linux:production as builder
+# Require the current commit hash to be provided as an argument
+ARG SUBSTRATE_CLI_GIT_COMMIT_HASH
+RUN test -n "$SUBSTRATE_CLI_GIT_COMMIT_HASH" || (echo "SUBSTRATE_CLI_GIT_COMMIT_HASH not set, provide via --build-arg SUBSTRATE_CLI_GIT_COMMIT_HASH=(git rev-parse --short=11 HEAD)" && false)
+ENV SUBSTRATE_CLI_GIT_COMMIT_HASH=$SUBSTRATE_CLI_GIT_COMMIT_HASH
+WORKDIR /pop
+COPY . /pop
+RUN cargo build --release
+
+# Build image
+FROM debian:bullseye-slim as collator
+COPY --from=builder /pop/target/release/pop-node /usr/bin/pop-node
+CMD ["/usr/bin/pop-node"]