Revert "fix: add DOCKER_SOCK env"

This reverts commit a49c8074c3.

.drone.yml

@@ -6,8 +6,10 @@ name: default
 clone:
   depth: 0
 
-environment:
+volumes:
-  DOCKER_HOST: tcp://localhost:2375
+- name: docker.sock
+  host:
+    path: /var/run/docker.sock
 
 steps:
 - name: release