feat: add docker image

.Dockerignore

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+*_out/
+.builds/
+.github/
+.vscode/
+TODO
+book/
+docs/
+examples/
+target/
+tests/

Dockerfile

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+FROM rust:1.50.0 AS build
+WORKDIR /usr/src
+
+# Download the target for static linking.
+RUN rustup target add x86_64-unknown-linux-musl
+
+# Create a dummy project and build the app's dependencies.
+# If the Cargo.toml or Cargo.lock files have not changed,
+# we can use the docker build cache and skip these (typically slow) steps.
+WORKDIR /usr/src/sabre
+COPY Cargo.toml Cargo.lock ./
+
+# Copy the source and build the application.
+COPY src ./src
+COPY lib ./lib
+COPY builtin ./builtin
+RUN cargo install --target x86_64-unknown-linux-musl --path .
+
+RUN cargo build --release
+
+# Copy the statically-linked binary into a scratch container.
+FROM alpine:3.13
+
+LABEL maintainer="Garrit Franke <garrit@slashdev.space>"
+
+COPY --from=build /usr/local/cargo/bin/sabre /bin
+
+RUN sabre --version
+
+ENTRYPOINT ["sabre"]