Trying to fix CI.

.drone.yml

@@ -21,11 +21,18 @@ depends_on:
 trigger:
   branch: ["main"]
 
+services:
+  - name: docker
+    image: "docker:20.10.17-dind"
+
 steps:
   - name: "mirror"
     image: "docker:20.10.17-dind"
     pull: if-not-exists
     environment:
+      DOCKER_HOST: tcp://docker:2375
+      DOCKER_TCP_PORT: 2375
+      DOCKER_TLS_CERTDIR: ""
       REGISTRY_USER: drone
       REGISTRY_PASSWORD:
         from_secret: drone_secret