generate excel worksheets when data is available instead of on-demand

src/preinstall.sh

@@ -20,6 +20,7 @@ getent passwd "$USER" >/dev/null || useradd -r -g "$GROUP" -m -s /bin/bash -c "v
 
 # create vctp data directory if it doesn't exist
 [ -d /var/lib/vctp ] || mkdir -p /var/lib/vctp
+[ -d /var/lib/vctp/reports ] || mkdir -p /var/lib/vctp/reports
 
 # set user ownership on vctp data directory if not already done
 [ "$(stat -c "%U" /var/lib/vctp)" = "$USER" ] || chown -R "$USER" /var/lib/vctp