Add manual workflow to update live demo

- Add GitHub Actions workflow for manual deployment
- Uses SSH to connect to server and run docker compose commands
- Triggered manually via workflow_dispatch

Author: codebude

.github/workflows/update-demo.yml

@@ -0,0 +1,20 @@
+name: Update Live Demo
+
+on:
+  workflow_dispatch:
+
+jobs:
+  deploy:
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Deploy to server
+        uses: appleboy/ssh-action@v1.0.0
+        with:
+          host: ${{ secrets.SSH_HOST }}
+          username: ${{ secrets.SSH_USER }}
+          key: ${{ secrets.SSH_PRIVATE_KEY }}
+          script: |
+            cd /srv/masscodeweb
+            docker compose pull
+            docker compose up -d --force-recreate