cicd: fix dockersock

.drone.yml

@@ -25,6 +25,9 @@ services:
 steps:
   - name: setup_image
     image: docker:dind
+    volumes:
+    - name: dockersock
+      path: /var/run
     commands:
       - until docker info; do echo "Waiting for Docker daemon..."; sleep 1; done
       - docker build -t ubuntu_amd64 -f ./tools/docker/linux_amd64 .