Updated Dockerfile

Dockerfile

@@ -1,5 +1,5 @@
 # Stage 1: Build binary
-FROM rust:latest AS builder
+FROM rust:1.85-bookworm AS builder
 WORKDIR /app
 COPY . .
 RUN cargo build --release
@@ -7,4 +7,5 @@ RUN cargo build --release
 # Stage 2: Final minimal execution layer
 FROM debian:bookworm-slim
 WORKDIR /app
+COPY --from=builder /app/target/release/huffman-compression-rs /app/huffman-compression-rust
 ENTRYPOINT ["/app/huffman-compression-rust"]