FROM rust:1-slim-bookworm AS builder
WORKDIR /app

# Cache dependencies before copying source
COPY Cargo.toml Cargo.lock ./
RUN mkdir src && echo "fn main() {}" > src/main.rs \
    && cargo build --release \
    && rm -rf src

COPY src ./src
# Touch main.rs so cargo knows the real source changed
RUN touch src/main.rs && cargo build --release

FROM debian:bookworm-slim
RUN apt-get update && apt-get install -y ca-certificates && rm -rf /var/lib/apt/lists/*
COPY --from=builder /app/target/release/rustification-server /usr/local/bin/server
EXPOSE 3000
CMD ["server"]