FROM rust:1.75-slim AS builder
WORKDIR /app

# Cache dependencies first
COPY Cargo.toml ./
COPY src ./src
RUN cargo build --release

FROM debian:bookworm-slim AS runtime
RUN apt-get update && apt-get install -y --no-install-recommends ca-certificates && rm -rf /var/lib/apt/lists/*
WORKDIR /app
COPY --from=builder /app/target/release/rustapi /usr/local/bin/rustapi
EXPOSE 8080
CMD ["rustapi"]