FIX #4: added DISABLE_STATS flag and moved stats refresh in a dedicated script

rootfs/app/stats.sh

@@ -0,0 +1,15 @@
+#!/bin/sh
+
+if [ "${DISABLE_STATS:-0}" -eq 1 ] ; then
+  exit 0
+fi
+
+PATH_BASE=/data
+PATH_STATS=${PATH_BASE}/stats
+PATH_STATSDB=${PATH_BASE}/stats.db
+PATH_LOGS=${PATH_BASE}/logs
+
+/usr/bin/goaccess "${PATH_LOGS}/nginx-access.log.1" \
+    --agent-list --anonymize-ip --real-os \
+    --output "${PATH_STATS}/index.html" --log-format COMBINED \
+    --tz="${TZ}" "--db-path=${PATH_STATSDB}" --persist --restore