# === Builder Stage ===
FROM alpine as builder

# Install cmake to manage the build process. Removing cache by `docker builder prune`
RUN --mount=type=cache,target=/var/cache/apk,sharing=locked \
    apk add --cache-dir /var/cache/apk g++ make cmake

# Alternatively, you can use --no-cache option to avoid creating a cache inside the container.
# However, note that this will also prevent the use of the shared cache, affecting caching efficiency.
# see also https://stackoverflow.com/questions/49118579/alpine-dockerfile-advantages-of-no-cache-vs-rm-var-cache-apk
# Examples:
# RUN apk --no-cache add g++ make cmake
# or
# RUN apk add g++ make cmake && apk add vim && rm -rf /var/cache/apk

# 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 alpine

# 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"]