Modified docker definitions to use internal caddy_net

Exposing ports on docker-compose bypasses UFW definitions, which is a
high risk, so we use internal networks only to connect between
containers

templates/monitoring/docker-compose.yml

@@ -3,8 +3,6 @@ services:
     image: prom/prometheus:latest
     container_name: prometheus
     restart: always
-    ports:
-      - "9090:9090"
     volumes:
       - ./prometheus.yml:/etc/prometheus/prometheus.yml
     networks:
@@ -15,12 +13,12 @@ services:
     image: prom/node-exporter:latest
     container_name: node-exporter
     restart: always
-    ports:
-      - "9100:9100"
     networks:
       - monitoring_net
 
 networks:
   monitoring_net:
     driver: bridge
+  caddy_net:
+    external: true