disable base image pull

.drone.yml

@@ -5,7 +5,6 @@ pipeline:
      - cp nginx.conf /etc/nginx/
      - nginx -t
  docker:
-    custom_dns: ["172.16.28.1", "8.8.8.8"]
     image: plugins/docker
     repo: repo.shimun.net/shimun/seafile
     registry: repo.shimun.net
@@ -14,3 +13,4 @@ pipeline:
     storage_path: /drone/.docker
     cache_from: ["repo.shimun.net/shimun/seafile", "repo.shimun.net/shimun/seafile:nginx-deb", "repo.shimun.net/shimun/seafile:alpine"]
     use_cache: true
+    pull_image: false