# Stage 1: Build
FROM alpine:latest AS builder

RUN apk add --no-cache build-base gcc

WORKDIR /app

COPY . .

RUN gcc -static -o deployment deployment.c

# Stage 2: Runtime
FROM alpine:latest

RUN addgroup -S appgroup && adduser -S appuser -G appgroup

WORKDIR /app

COPY --from=builder /app/deployment .

RUN mkdir /output && chown appuser:appgroup /output

VOLUME ["/output"]

USER appuser

HEALTHCHECK --interval=30s --timeout=5s --start-period=15s --retries=3 \
    CMD test -f /output/output.txt || exit 1

ENTRYPOINT ["/bin/sh", "-c"]
CMD ["./deployment 10 > /output/output.txt && tail -f /output/output.txt"]