fix: Allow access to network for GitHub mirroring

docker-compose.yml

@@ -8,7 +8,7 @@ networks:
 
 services:
   db:
-    image: postgres:9.6
+    image: postgres:13.2-alpine
     restart: always
     environment:
       - POSTGRES_PORT=${POSTGRES_PORT}
@@ -39,6 +39,8 @@ services:
     networks:
       - gitea
       - proxy_home
+      # To enable GitHub mirroring
+      - default
     volumes:
       - ./gitea:/data
       - /etc/timezone:/etc/timezone:ro