fix(docker): add latex packages to backend container

docker/backend/Dockerfile

@@ -17,7 +17,6 @@ RUN --mount=type=cache,target=/var/cache/apt,sharing=locked \
 apt-get -y update && apt-get install -y --no-install-recommends 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 pdftk
 # RUN apt-get -y update && apt-get -y install \
 # texlive texlive-latex-recommended texlive-luatex texlive-plain-generic texlive-lang-german texlive-lang-english
@@ -25,6 +24,7 @@ RUN apt-get -y update && apt-get -y install \
     wget \
     perl \
     xz-utils \
+    fonts-roboto \
     texlive \
     texlive-luatex \
     texlive-latex-extra \
@@ -39,17 +39,17 @@ RUN tlmgr init-usertree
 RUN tlmgr option repository ftp://tug.org/historic/systems/texlive/2018/tlnet-final
 RUN tlmgr update --self --all
 RUN tlmgr install \
-      babel 
-      # babel-english \
-      # babel-german \
-      # luatex lualatex luatexbase lualatex-math \
-      # booktabs \
-      # textpos \
-      # enumitem \
-      # eurosym  \
-      # koma-script \
-      # unicode-math \
-      # selnolig
+      babel \
+      babel-english \
+      babel-german \
+      booktabs \
+      textpos \
+      enumitem \
+      # luatex lualatex luatexbase lualatex-math eurosym \
+      # above line requires tlmgr to run in -sys mode (~root?! apparently -privileged is missing)
+      koma-script \
+      unicode-math \
+      selnolig