Update .drone.yml

.drone.yml

@@ -5,14 +5,20 @@ name: default
 steps:
   - name: debug registry secrets
     image: alpine
-    secrets: [ docker_username, docker_password, test ]
+    environment:
+      USERNAME:
+        from_secret: docker_username
+      PASSWORD:
+        from_secret: docker_password
+      TEST
+        from_secret: test
     commands:
       - echo ${TEST}
       - echo $TEST
       - echo $test
       - echo "${test}"
       - echo ${USERNAME}
-      - echo "${docker_password}"
+      - echo ${docker_password}
 
   - name: build and push flappy image
     image: plugins/docker