The Dockerfile for the latest and snapshot versions are managed in the GitHub project. The Dockerfile for v2.3.2 looks like this:
FROM alpine:3.9
RUN apk add --update coreutils git build-base automake autoconf linux-headers
RUN git clone --branch=2.3.2 --depth=1 https://github.com/troglobit/pimd.git /root/pimd
WORKDIR /root/pimd
RUN git submodule update --init
RUN ./configure --prefix=/usr --sysconfdir=/etc
RUN make
RUN DESTDIR=/tmp make install
RUN ls -lR /tmp
FROM alpine:3.9
COPY --from=0 /tmp/usr/sbin/pimd /usr/sbin/
CMD [ "/usr/sbin/pimd", "--foreground" ]
docker pull troglobit/pimd