Update '.drone.yml'

.drone.yml

@@ -3,8 +3,18 @@ type: docker
 name: default
 
 steps:
-- name: greeting
-  image: alpine
-  commands:
-  - echo hello
-  - echo world
+- name: test_docker_exec
+  image: appleboy/drone-ssh
+  host:
+    from_secret: docker_host
+  username:
+    from_secret: docker_user
+  key:
+    from_secret: docker_privkey
+  port: 2200
+  script:
+   - echo hello world
+   - docker ps -a
+   - docker run hello-world
+  when:
+    branch: [main]