+ xsel install in yadm playbook post tasks

playbooks/debops/yadm.yml

@@ -54,6 +54,9 @@
       args:
         executable: /bin/bash
 
+    - name: Xsel for working clipboard copy with X11 forwarding (use SSH -Y)
+      shell: apt install -t xsel -yy
+
   roles:
     - role: keyring
       tags: [ 'role::keyring', 'skip::keyring', 'role::yadm' ]