Adding Dockerfile

Dockerfile

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+FROM rust:alpine as builder
+
+WORKDIR /app
+
+RUN apk add --no-cache musl-dev
+
+# This should fetch the index and cache it. This should reduce subsequent builds
+RUN cargo search test
+
+COPY Cargo.toml Cargo.lock /app/
+# COPY .cargo /app/.cargo
+
+COPY src /app/src
+
+RUN cargo build --release
+
+FROM alpine
+
+COPY --from=builder /app/target/release/rustocat /usr/bin/rustocat
+
+ENTRYPOINT ["rustocat"]
+