Remove any keyserver log files during upgrades

src/freedombone-upgrade

 
 update-ca-certificates
 
+# remove any keyserver log files
+if [ -d /var/lib/sks/DB ]; then
+    cd /var/lib/sks/DB
+    db_archive -d
+fi
+
 if [ ! -d $PROJECT_DIR ]; then
     git_clone $PROJECT_REPO $PROJECT_DIR
 fi