Add RRDTool integration for monitoring WireGuard stats

Introduces a new RRDTool service for tracking WireGuard interface and peer statistics. Adds required Docker configuration, API key handling, and new scripts for managing RRD files. Updates the `entrypoint.sh` and API permissions to accommodate the new functionality.

entrypoint.sh

@@ -2,7 +2,7 @@
 
 set -e
 
-if [[ "$COMPOSE_VERSION" != "02b" ]]; then
+if [[ "$COMPOSE_VERSION" != "02r" ]]; then
     echo "ERROR: Please upgrade your docker compose file. Exiting."
     exit 1
 fi
@@ -17,6 +17,10 @@ if [[ "${DEBUG_MODE,,}" == "true" ]]; then
     DEBUG_VALUE="True"
 fi
 
+if [ ! -f /app_secrets/rrdtool_key ]; then
+    cat /proc/sys/kernel/random/uuid > /app_secrets/rrdtool_key
+fi
+
 cat > /app/wireguard_webadmin/production_settings.py <<EOL
 DEBUG = $DEBUG_VALUE
 ALLOWED_HOSTS = ['wireguard-webadmin', '$SERVER_ADDRESS']