fix: install logrotate (required by check-backup script)

tasks/install_ibmsp_client.yml

@@ -54,6 +54,10 @@
       apt:
         name: "git"
         state: latest
+    - name: install logrotate (required by check-backup script)
+      apt:
+        name: "logrotate"
+        state: latest
     - name: check out check-backup Git repo
       git:
         repo: "git@git.slub-dresden.de:slub-referat-2-3/check-backup.git"