FROM alpine AS builder ARG MDNS_REPEATER_VERSION=local WORKDIR / COPY mdns-repeater.c mdns-repeater.c RUN set -ex && \ apk add --no-cache build-base && \ gcc -o /bin/mdns-repeater mdns-repeater.c -DMDNS_REPEATER_VERSION=\"${MDNS_REPEATER_VERSION}\" FROM alpine RUN set -ex && \ apk add --no-cache vlan libcap bash COPY --from=builder /bin/mdns-repeater /bin/mdns-repeater COPY run.sh /app/ RUN chmod +x /bin/mdns-repeater && setcap cap_net_raw=+ep /bin/mdns-repeater && chmod +x /app/run.sh ENTRYPOINT ["/app/run.sh", "${VLANS}"]