Install rsync in job container before sync step

.forgejo/workflows/deploy.yml

@@ -10,6 +10,9 @@ jobs:
     steps:
       - uses: actions/checkout@v4
 
+      - name: Install rsync
+        run: apt-get update -qq && apt-get install -y -qq rsync
+
       # The job container only sees its own checkout — the live app lives
       # at /mnt/user/appdata/greendale on the host, bind-mounted into this
       # container at the same path (see runner container.options) so