add credentials for dockerhub

.drone.yml

@@ -3,22 +3,26 @@ kind: pipeline
 name: build-and-upload
 
 steps:
-- name: build-and-push
-  image: plugins/docker
-  environment:
-    DOCKER_BUILDKIT: 1
-  network_mode: bridge
-  settings:
-    repo: sneak/builder
-    custom_dns: [ 116.202.204.30 ]
-    tags:
-      - ${DRONE_COMMIT_SHA}
-      - ${DRONE_BRANCH}
-      - latest
-- name: notify
-  image: plugins/slack
-  settings:
-    webhook:
-      from_secret: SLACK_WEBHOOK_URL
-  when:
-    event: pull_request
+  - name: build-and-push
+    image: plugins/docker
+    environment:
+      DOCKER_BUILDKIT: 1
+    network_mode: bridge
+    settings:
+      repo: sneak/builder
+      custom_dns: [116.202.204.30]
+      tags:
+        - ${DRONE_COMMIT_SHA}
+        - ${DRONE_BRANCH}
+        - latest
+      username:
+        from_secret: DOCKER_USERNAME
+      password:
+        from_secret: DOCKER_TOKEN
+  - name: notify
+    image: plugins/slack
+    settings:
+      webhook:
+        from_secret: SLACK_WEBHOOK_URL
+    when:
+      event: pull_request