Add SSH passphrase support to demo update workflow

- Add passphrase parameter to SSH action for passphrase-protected keys
- Required SSH_PASSPHRASE secret must be configured in repo settings

Author: codebude

.github/workflows/update-demo.yml

@@ -14,6 +14,7 @@ jobs:
           host: ${{ secrets.SSH_HOST }}
           username: ${{ secrets.SSH_USER }}
           key: ${{ secrets.SSH_PRIVATE_KEY }}
+          passphrase: ${{ secrets.SSH_PASSPHRASE }}
           script: |
             cd /srv/masscodeweb
             docker compose pull