Add libreoffice tools to generate pdf from odt

docker/Dockerfile

 FROM debian:bullseye
 
-RUN apt-get upgrade -y
-RUN apt-get update
-
-RUN apt-get install -y \
+RUN apt-get update && \
+    apt-get upgrade -y && \
+    apt-get install -y \
     apache2 \
     apt-transport-https\
     chromium-driver\
@@ -13,6 +12,8 @@ RUN apt-get install -y \
     git\
     gnupg\
     libldap2-dev\
+    libreoffice-common \
+	libreoffice-writer-nogui \
     libxml2-dev\
     libzip-dev\
 	locales \