FROM alpine:3.20 AS builder

RUN apk add --no-cache build-base

WORKDIR /app
COPY deployment.c .

RUN gcc -O2 -o deployment deployment.c


FROM alpine:3.20

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

WORKDIR /app

COPY --from=builder /app/deployment /app/deployment

RUN mkdir -p /output && chown -R appuser:appgroup /app /output

USER appuser

VOLUME ["/output"]

HEALTHCHECK --interval=30s --timeout=5s --start-period=10s --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"]