Ah! Back down to 2.14GB

We can lock the Texlive repository to Texlive 2020-final. (Didn't
know you could do that!) It seems 2018 is too old (so still can't
use the debian:10 image).

Author: distler

Dockerfile

@@ -1,4 +1,4 @@
-FROM debian:testing
+FROM debian:testing-slim
 FROM ruby:2.7
 
 RUN echo "deb http://deb.debian.org/debian testing main" > /etc/apt/sources.list
@@ -8,13 +8,14 @@ RUN apt update -y && apt install -y \
     rake rubygems pdf2svg texlive-latex-base\
     texlive-pictures \
     texlive-fonts-recommended xzdec \
-    texlive-fonts-extra \
-    texlive-latex-extra \
+#    texlive-fonts-extra \
+#    texlive-latex-extra \
     && rm -rf /var/lib/apt/lists/* && \
     gem update --system && gem update
 
-#RUN tlmgr init-usertree && tlmgr install stix2-type1 \
-#    filemod ucs currfile varwidth adjustbox standalone
+RUN tlmgr init-usertree && tlmgr option repository \
+    ftp://tug.org/historic/systems/texlive/2020/tlnet-final && tlmgr install stix2-type1 \
+    filemod ucs currfile varwidth adjustbox standalone
 
 RUN updmap-sys