ci: Added rsync installation to the github action for mkdocs

Author: simwai

.github/workflows/deploy-docs.yml

@@ -27,7 +27,7 @@ jobs:
         run: pdm mkdocs-build
 
       - name: Install sshpass
-        run: sudo apt-get update && sudo apt-get install -y sshpass
+        run: sudo apt-get update && sudo apt-get install -y sshpass rsync
 
       - name: Add VPS to known_hosts
         run: |