Add Dockerfile

Dockerfile

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+FROM rust:slim-bookworm as builder
+WORKDIR /usr/src/k4status
+ENV TARGET x86_64-unknown-linux-musl
+RUN apt-get update &&\
+    apt-get --no-install-recommends -y install musl-tools &&\
+    rustup target add "$TARGET"
+COPY . .
+RUN cargo install --target "$TARGET" --path .
+
+FROM scratch
+COPY --from=builder /usr/local/cargo/bin/k4status /
+EXPOSE 3000
+CMD ["./k4status"]