# === Builder Stage ===
FROM ubuntu as builder

# Install cmake to manage the build process. Removing cache by `docker builder prune`
RUN --mount=type=cache,target=/var/cache/apt,sharing=locked --mount=type=cache,target=/var/lib/apt,sharing=locked \
    rm -f /etc/apt/apt.conf.d/docker-clean \
    && echo 'Binary::apt::APT::Keep-Downloaded-Packages "true";' > /etc/apt/apt.conf.d/keep-cache \
    && apt-get update \
    && apt-get install -y --no-install-recommends g++ make cmake

# Copy all source files from the current directory to /app in the image
COPY CMakeLists.txt .
COPY src ./src

# Configuring, building  and install the app
RUN cmake . \
    && make \
    && make install

# === Production Stage ===
FROM ubuntu

# Copy only the built artifacts from the builder stage
COPY --from=builder /usr/local/bin/HelloWorldApp /HelloWorldApp

# Setting entry point to the app binary
ENTRYPOINT ["/HelloWorldApp"]