borg-server: Use full path to borg

roles/borg-server/tasks/main.yml

@@ -24,5 +24,5 @@
     user=borg
     key="{{ item.stdout }}"
     manage_dir=yes
-    key_options="command=\"borg serve --restrict-to-path {{ backup_dir }}/{{ item['item'] }}\",no-pty,no-agent-forwarding,no-port-forwarding,no-X11-forwarding,no-user-rc"
+    key_options="command=\"/usr/bin/borg serve --restrict-to-path {{ backup_dir }}/{{ item['item'] }}\",no-pty,no-agent-forwarding,no-port-forwarding,no-X11-forwarding,no-user-rc"
   with_items: "{{ ssh_keys.results }}"