clean up old OpenSkyDB files on container start

rootfs/etc/cont-init.d/50-get-openskydb

@@ -6,12 +6,15 @@ APPNAME="$(hostname)/get-openskydb"
 # Copyright 2020-2022 Ramon F. Kolb - licensed under the terms and conditions
 # of GPLv3. The terms and conditions of this license are included with the Github
 # distribution of this package, and are also available here:
-# https://github.com/kx1t/planefence4docker/
+# https://github.com/kx1t/docker-planefence/
 #
 # This package may incorporate other software and license terms.
 # -----------------------------------------------------------------------------------
 #
 
+# Cleanup all but the newest OpenSkyDB file
+find /usr/share/planefence/html/ -type f -name "OpenSky*.csv" -printf '%T@ %p\n'| sort -g | head -n -1 | cut -d ' ' -f 2 | xargs rm -f
+
 echo "[$(date)][$APPNAME] OpenSky DB checking has been temporarily disabled."
 exit 0