Add Dockerfile

Dockerfile

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+FROM rust:latest as builder
+
+USER root
+
+RUN apt update && apt install -y ca-certificates
+
+WORKDIR /app
+COPY Cargo.toml .
+COPY src ./src
+
+RUN cargo build --release
+
+FROM gcr.io/distroless/cc-debian13:nonroot
+
+COPY --from=builder /app/target/release/image-proxy /usr/local/bin/image-proxy
+
+COPY --from=builder /etc/ssl /etc/ssl
+
+EXPOSE 8080
+
+ENTRYPOINT ["image-proxy"]