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Dockerfile
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####################################################################################################
## Builder
####################################################################################################
FROM rust:latest AS builder
# Create appuser
ENV USER=appuser
ENV UID=10001
RUN adduser \
--disabled-password \
--gecos "" \
--home "/nonexistent" \
--shell "/sbin/nologin" \
--no-create-home \
--uid "${UID}" \
"${USER}"
WORKDIR /app
COPY ./Cargo.toml ./Cargo.toml
COPY ./shared ./shared
COPY ./shared_types ./shared_types
COPY ./server ./server
WORKDIR /app/server
RUN cargo build --release
####################################################################################################
## Final image
####################################################################################################
FROM debian:bookworm-slim
RUN apt-get update && apt-get install libssl3 ca-certificates -y && rm -rf /var/lib/apt/lists/*
RUN update-ca-certificates
# Import from builder.
COPY --from=builder /etc/passwd /etc/passwd
COPY --from=builder /etc/group /etc/group
WORKDIR /app
# Copy our build
COPY --from=builder /app/target/release/animal-hunt-server ./
# Use an unprivileged user.
USER appuser:appuser
EXPOSE 8080
CMD ["/app/animal-hunt-server"]