Update .drone.yml

.drone.yml

@@ -3,18 +3,10 @@ type: docker
 name: default
 
 steps:
-  - name: build
-    image: plugins/docker
-    settings:
-      dockerfile: Dockerfile
-      tags:
-        - ${DRONE_REPO_OWNER}/${DRONE_REPO_NAME}:${DRONE_COMMIT_SHA}
-        - ${DRONE_REPO_OWNER}/${DRONE_REPO_NAME}:latest
-
   - name: publish
     image: plugins/docker
     settings:
-      repo: ${DRONE_REPO_OWNER}/${DRONE_REPO_NAME}
+      repo: ${docker_username}/${DRONE_REPO_NAME}
       tags:
         - latest
         - ${DRONE_COMMIT_SHA}