Docker image

[koppor]

I would like to have a recent docker image at hand with @rbrito's additions in there.

I started with the following file (inspired by https://github.com/pts/pdfsizeopt/blob/master/extra/debian/control)

FROM debian:stable-20210408-slim

ENV LANG=C.UTF-8 \
    LC_ALL=C.UTF-8 \
    TERM=dumb

RUN apt-get update && \
    apt-get install -y python2 ghostscript png22pnm sam2p jbig2enc multivalent pngout && \
    # save some space
    rm -rf /var/lib/apt/lists/* && apt-get clean

However, I fail:

#6 6.033 E: Unable to locate package png22pnm
#6 6.033 E: Unable to locate package sam2p
#6 6.033 E: Unable to locate package jbig2enc
#6 6.033 E: Unable to locate package multivalent
#6 6.033 E: Unable to locate package pngout

Is it possible to provide a hint with packages to install to use a "good" compression? I saw cf8fc1c using zopfli.

I would use the "official" image , but it does a) not contain the latest additions and b) I hit pts#114 (comment) in my rather minimal file (WIP at gi-ev/LNI-proceedings#13).