add wget

base/Dockerfile

@@ -53,6 +53,7 @@ RUN apt-get install -y nodejs
 # install min texlive (necessary for nb exports)
 RUN apt-get update --yes && \
     apt-get install --yes --no-install-recommends \
+    wget \
     texlive-xetex \
     texlive-fonts-recommended \
     texlive-plain-generic && \