Dockerfile

FROM ubuntu:16.04
ARG DEBIAN_FRONTEND=noninteractive
RUN apt update
RUN apt -y install software-properties-common
RUN add-apt-repository -y ppa:milter-manager/ppa
RUN apt update
RUN apt -y install milter-manager
WORKDIR /src
RUN ldd /usr/bin/milter-test-server | tr -s '[:blank:]' '\n' | grep '^/' | \
    xargs -I % sh -c 'mkdir -p $(dirname deps%); cp % deps%;'

FROM scratch
COPY --from=0 /src/deps /
COPY --from=0 /usr/bin/milter-test-server /milter-test-server

ENTRYPOINT ["/milter-test-server"]