Install rsync

Author: jmikola

.github/workflows/docs.yml

@@ -35,6 +35,10 @@ jobs:
           path: docs
           fetch-depth: 2
 
+      # python:2.7.18-buster does not include rsync
+      - name: "Install rsync"
+        run: "apt-get update && apt-get -y install rsync"
+
       # The requirements file installs urllib3 with an incompatible version; we replace it with one that works
       - name: "Install giza"
         run: |