keep only latest published docker image

.drone.yml

@@ -1,4 +1,5 @@
 kind: pipeline
+type: docker
 name: default
 
 steps:
@@ -20,9 +21,9 @@ steps:
     pull: always
     settings:
       dockerfile: Dockerfile
-      auto_tag: false
+      tags:
+        - latest
       force_tag: true
-      daemon_off: false
       password:
         from_secret: docker_password
       registry: docker.asperti.com