add credentials for dockerhub

.drone.yml

@@ -3,19 +3,23 @@ kind: pipeline
 name: build-and-upload
 
 steps:
-- name: build-and-push
+  - name: build-and-push
     image: plugins/docker
     environment:
       DOCKER_BUILDKIT: 1
     network_mode: bridge
     settings:
       repo: sneak/builder
-    custom_dns: [ 116.202.204.30 ]
+      custom_dns: [116.202.204.30]
       tags:
         - ${DRONE_COMMIT_SHA}
         - ${DRONE_BRANCH}
         - latest
-- name: notify
+      username:
+        from_secret: DOCKER_USERNAME
+      password:
+        from_secret: DOCKER_TOKEN
+  - name: notify
     image: plugins/slack
     settings:
       webhook: