Update guide.en-gb.md: fix Nextcloud connectivity, pull errors and persistence

- Fix "getaddrinfo for db failed" by adding an internal network.
- Fix Redis pull failure by correcting image name to lowercase.
- Correcting volume path case for MariaDB.
- Add 'config' volume to persist settings across restarts.
- Add 'traefik.docker.network' label for multi-network routing.

Author: afiand

pages/bare_metal_cloud/virtual_private_servers/install_nextcloud_on_vps_advanced/guide.en-gb.md

@@ -156,11 +156,15 @@ services:
       MYSQL_PASSWORD: ${DB_PASSWORD}
       MYSQL_ROOT_PASSWORD: ${DB_ROOT_PASSWORD}
     volumes:
-      - db_data:/var/lib/MySQL
+      - db_data:/var/lib/mysql
+    networks:
+      - internal
 
   Redis:
-    image: Redis:7-alpine
+    image: redis:7-alpine
     restart: unless-stopped
+    networks:
+      - internal
 
   app:
     image: nextcloud:apache
@@ -179,11 +183,14 @@ services:
       NEXTCLOUD_TRUSTED_DOMAINS: ${NC_DOMAIN}
     volumes:
       - nextcloud_html:/var/www/html
+      - config:/var/www/html/config
       - nextcloud_data:/var/www/html/data
     networks:
+      - internal
       - proxy
     labels:
       - traefik.enable=true
+      - traefik.docker.network=proxy
       - traefik.http.routers.nextcloud.rule=Host(`${NC_DOMAIN}`)
       - traefik.http.routers.nextcloud.entrypoints=websecure
       - traefik.http.routers.nextcloud.tls.certresolver=letsencrypt
@@ -192,8 +199,10 @@ volumes:
   db_data:
   nextcloud_html:
   nextcloud_data:
+  config:
 
 networks:
+  internal:
   proxy:
     external: true
 ```
@@ -229,4 +238,4 @@ For advanced or multi-service use, this guide is recommended.
 
 [Secure an OVHcloud VPS](/pages/bare_metal_cloud/virtual_private_servers/secure_your_vps)
 
-Join our [community of users](/links/community).
+Join our [community of users](/links/community).