Adjust Dockerfile and pipeline.

.drone.yml

@@ -20,8 +20,16 @@ steps:
 
   - name: deploy
     image: alpine
+    volumes:
+      - /var/run/docker.sock:/var/run/docker.sock
+    environment:
+      DOCKER_USERNAME:
+        from_secret: DOCKER_USERNAME
+      DOCKER_PASSWORD:
+        from_secret: DOCKER_PASSWORD
     commands:
       - echo "Deploying new version..."
+      - echo "$DOCKER_PASSWORD" | docker login --username "$DOCKER_USERNAME" --password-stdin registry.binderlab.io
       - docker pull registry.binderlab.io/harbormaster:latest
       - docker stop harbormaster || true
       - docker rm harbormaster || true