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backend/Dockerfile

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+# Build stage
+FROM rust:1.89-slim-bookworm AS builder
+WORKDIR /app
+RUN apt-get update && apt-get install -y pkg-config libssl-dev && rm -rf /var/lib/apt/lists/*
+COPY Cargo.toml Cargo.lock ./
+COPY src ./src
+RUN cargo build --release
+
+# Runtime stage
+FROM debian:bookworm-slim
+RUN apt-get update && apt-get install -y ca-certificates libssl3 && rm -rf /var/lib/apt/lists/*
+COPY --from=builder /app/target/release/backend /usr/local/bin/backend
+EXPOSE 3000
+CMD ["backend"]