Store the logo as we use it in tests

Author: vmcj

.github/jobs/baseinstall.sh

@@ -54,6 +54,7 @@ else
       --enable-judgehost-build=no | tee "$ARTIFACTS"/configure.txt
     make domserver
     make install-domserver
+    cp -r ${DIR}/doc /opt/domjudge/domserver/
 fi
 section_end