ci(Dockerfile): fontconfig

Dockerfile

@@ -13,7 +13,7 @@ ENV LANG C.UTF-8
 
 # install additional OS packages.
 RUN apt-get update && export DEBIAN_FRONTEND=noninteractive \
-    && apt-get -y install --no-install-recommends wget libfontconfig git make libfile-fcntllock-perl
+    && apt-get -y install --no-install-recommends wget fontconfig git make libfile-fcntllock-perl
 
 # TeXLive
 WORKDIR /tmp
@@ -26,4 +26,8 @@ RUN YEAR=$(ls -d /usr/local/texlive/2* | sed -e 's/.*[/]//g') \
     && echo MANPATH=/usr/local/texlive/$YEAR/texmf-dist/doc/man:$MANPATH >> ~/.profile \
     && echo INFOPATH=/usr/local/texlive/$YEAR/texmf-dist/doc/info:$INFOPATH >> ~/.profile \
     && echo PATH=/usr/local/texlive/$YEAR/bin/x86_64-linux:$PATH >> ~/.profile \
-    && . ~/.profile
+    && . ~/.profile \
+    # System font configuration for XeTeX and LuaTeX
+    && ln -s /usr/local/texlive/$YEAR/texmf-var/fonts/conf/texlive-fontconfig.conf /etc/fonts/conf.d/09-texlive.conf \ # Ref: https://www.tug.org/texlive/doc/texlive-en/texlive-en.html#x1-330003.4.4
+    && fc-cache -fv
+