build(docker/backend): add roboto and lualatex dependencies

docker/backend/Dockerfile

@@ -8,6 +8,10 @@ RUN apt-get -y update && apt-get -y install llvm
 RUN apt-get -y update && DEBIAN_FRONTEND=noninteractive apt-get install -y --no-install-recommends tzdata
 RUN apt-get -y update && apt-get -y install locales locales-all
 
+# run-time dependencies for uniworx binary
+RUN apt-get -y update && apt-get -y install fonts-roboto
+RUN apt-get -y update && apt-get -y install texlive-luatex
+
 ENV LANG=en_US.UTF-8
 
 # locally these two should be identical, so that compilation results are written out into the file dir.