Add files to produce Docker container

.dockerignore

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+target
+

Dockerfile

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+FROM rust:1.65-buster as builder
+
+RUN apt-get update && \
+    apt-get install -y libssl-dev pkg-config
+
+WORKDIR /srv
+
+# Build dependencies and cache them
+COPY Cargo.* ./
+RUN mkdir -p src && \
+    echo "fn main() {println!(\"if you see this, the build broke\")}" > src/main.rs && \
+    cargo build --release && \
+    rm -r src && \
+    rm target/release/deps/d53*
+
+# Build final app
+COPY ./src ./src
+RUN cargo build --release
+
+FROM debian:bullseye-slim
+RUN apt-get update && apt-get install -y libssl1.1 iptables ca-certificates
+COPY --from=builder /srv/target/release/d53 /usr/local/sbin/d53
+CMD ["/usr/local/sbin/d53"]