Removed variable expansion because plugin doesnt support it

.drone.yml

@@ -125,14 +125,12 @@ steps:
   - name: prod
     image: appleboy/drone-ssh
     environment:
-      SSH_USER:
+      PLUGIN_USER:
         from_secret: ssh_prod_user
-      SSH_PASS:
+      PLUGIN_PASSWORD:
         from_secret: ssh_prod_password
+      PLUGIN_HOST: ssh_prod_host
     settings:
-      host: 192.168.1.48
-      username: ${SSH_USER}
-      password: ${SSH_PASS}
       script:
         - docker stop webapi || true
         - docker rm webapi || true