build(up-parachain): add dockerfile

.dockerignore

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

Dockerfile

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+FROM rust as builder
+RUN apt-get update && apt-get -y install cmake
+WORKDIR /pop
+COPY . /pop
+RUN cargo build --release
+
+# Build image
+FROM rust:slim
+RUN apt-get update && apt install -y openssl ca-certificates protobuf-compiler
+COPY --from=builder /pop/target/release/pop /usr/bin/pop
+CMD ["/usr/bin/pop"]