Add a nice optimized dockerfile for deployment

Dockerfile

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+FROM rust:1.72
+
+RUN USER=root cargo new --bin nederlandskie
+WORKDIR /nederlandskie
+
+COPY ./Cargo.lock ./Cargo.lock
+COPY ./Cargo.toml ./Cargo.toml
+
+RUN cargo build --release
+RUN rm src/*.rs
+
+COPY ./src ./src
+
+RUN rm ./target/release/deps/nederlandskie*
+RUN cargo build --release
+
+EXPOSE 3000
+CMD ["./target/release/nederlandskie"]