FROM rust:1.94-bookworm AS builder
WORKDIR /build
COPY Cargo.toml Cargo.lock* ./
RUN mkdir src && printf 'fn main() {}\n' > src/main.rs
RUN cargo build --release
RUN rm -rf src
COPY src ./src
RUN touch src/main.rs && cargo build --release

FROM debian:bookworm-slim
RUN apt-get update \
    && apt-get install -y --no-install-recommends ca-certificates \
    && rm -rf /var/lib/apt/lists/*
COPY --from=builder /build/target/release/matrix-r9k /usr/local/bin/matrix-r9k
RUN useradd --system --uid 10001 --home-dir /data r9k
USER 10001:10001
ENTRYPOINT ["/usr/local/bin/matrix-r9k"]