update ci

.drone.yml

@@ -1,18 +1,8 @@
 ---
-kind: pipeline
-type: docker
-name: default
-
-steps:
-  - name: build_deploy
+pipeline:
+  build_deploy:
     image: deblan/devenv
-    environment:
-      SSH_PUB_KEY:
-        from_secret: ssh_pub_key
-      SSH_PRIV_KEY:
-        from_secret: ssh_priv_key
-      SSH_USER_HOST:
-        from_secret: ssh_user_host
+    secrets: [ssh_user_host, ssh_priv_key]
     commands:
       - pip3 install mkdocs
       - mkdocs build