Networks: create internal docker network for proxy server

Prepare to use caddy in docker

files/outline/docker-compose.yml.j2

@@ -6,11 +6,14 @@ services:
     image: outlinewiki/outline:0.83.0
     container_name: outline_app
     restart: unless-stopped
-    ports:
-      - "127.0.0.1:{{ outline_port }}:3000"
     depends_on:
       - outline_postgres
       - outline_redis
+    ports:
+      - "127.0.0.1:{{ outline_port }}:3000"
+    networks:
+      - "outline_network"
+      - "{{ web_proxy_network }}"
     environment:
       NODE_ENV: 'production'
       URL: 'https://outline.vakhrushev.me'
@@ -52,6 +55,9 @@ services:
     image: valkey/valkey:8.1.1-alpine
     container_name: outline_redis
     restart: unless-stopped
+    networks:
+      - "outline_network"
+    
 
   outline_postgres:
     image: postgres:16.3-bookworm
@@ -59,7 +65,15 @@ services:
     restart: unless-stopped
     volumes:
       - {{ postgres_data_dir }}:/var/lib/postgresql/data
+    networks:
+      - "outline_network"
     environment:
       POSTGRES_USER: '{{ outline_postgres_user }}'
       POSTGRES_PASSWORD: '{{ outline_postgres_password }}'
       POSTGRES_DB: '{{ outline_postgres_database }}'
+
+networks:
+  outline_network:
+    driver: bridge
+  {{ web_proxy_network }}:
+    external: true