Fix DB DNS with vpn_internal compose network

Co-authored-by: Cursor <cursoragent@cursor.com>

docker-compose.yml

@@ -22,6 +22,7 @@ services:
       ADMIN_PASSWORD: ${ADMIN_PASSWORD:-change-me-strong-password}
       ADMIN_EMAIL: ${ADMIN_EMAIL:-admin@example.com}
 
+      # hostname of the compose service below
       POSTGRES_HOST: ${POSTGRES_HOST:-postgres}
       POSTGRES_USER: ${POSTGRES_USER:-vpn}
       POSTGRES_PASSWORD: ${POSTGRES_PASSWORD:-vpn}
@@ -44,6 +45,7 @@ services:
       - wg_data:/data/wireguard
       - awg_data:/data/amneziawg
     networks:
+      - vpn_internal
       - dokploy-network
     healthcheck:
       test: ["CMD", "curl", "-f", "http://127.0.0.1:8000/health"]
@@ -62,7 +64,10 @@ services:
     volumes:
       - postgres_data:/var/lib/postgresql/data
     networks:
-      - dokploy-network
+      vpn_internal:
+        aliases:
+          - postgres
+          - db
     healthcheck:
       test: ["CMD-SHELL", "pg_isready -U $$POSTGRES_USER -d $$POSTGRES_DB"]
       interval: 5s
@@ -71,6 +76,10 @@ services:
       start_period: 10s
 
 networks:
+  # Compose DNS (panel -> postgres) works on this project network
+  vpn_internal:
+    driver: bridge
+  # Traefik / Dokploy public routing
   dokploy-network:
     external: true