action echo some variables

.github/workflows/demo.yml

@@ -30,6 +30,7 @@ jobs:
           IdentityFile ~/.ssh/demo.key
           StrictHostKeyChecking no
         END
+        echo "user: $SSH_USER, host: $SSH_HOST, path: $DEMO_WEB_ROOT"
     # Deploy
     - name: Fetch code and update
       run: |