Add docker images (#5)

Dockerfile

@@ -0,0 +1,10 @@
+FROM rust:1.66.1-alpine3.17 as builder
+WORKDIR /src
+RUN apk update && apk add --no-cache gcc musl-dev
+COPY ./ .
+RUN cargo build --release
+
+FROM alpine:3.17.1
+COPY --from=builder /src/target/release/cdh /bin/cdh
+WORKDIR /workdir
+ENTRYPOINT ["/bin/cdh"]