Fix PDF and TeX generation

apache/dockerfile

@@ -8,7 +8,9 @@ RUN apt update -y && apt install -y \
     libexpat1  \
     apache2-utils \
     ssl-cert \
-    libapache2-mod-wsgi-py3
+    libapache2-mod-wsgi-py3 \
+    pandoc \
+    texlive-xetex
 
 RUN echo "LoadModule wsgi_module /usr/lib/apache2/modules/mod_wsgi.so" >> ${HTTPD_CONF} \
  && echo "IncludeOptional conf.d/*.conf" >> ${HTTPD_CONF}