Syncing with codecrafters-io/languages

Created by https://github.com/codecrafters-io/languages

Dockerfile

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+FROM rust:1.43-buster
+
+# Download docker-explorer
+ARG docker_explorer_version=v18
+RUN curl --fail -Lo /usr/local/bin/docker-explorer https://github.com/codecrafters-io/docker-explorer/releases/download/${docker_explorer_version}/${docker_explorer_version}_linux_amd64
+RUN chmod +x /usr/local/bin/docker-explorer
+
+# Grab the dependencies and compile them as they dont change much
+WORKDIR /app
+COPY Cargo.toml /app/Cargo.toml
+COPY Cargo.lock /app/Cargo.lock
+RUN mkdir src && echo "fn main() {}" > "src/main.rs"
+RUN cargo build --release
+
+# Grab the real code
+ADD . /app
+WORKDIR /app
+
+ENTRYPOINT ["/app/your_docker.sh"]