Uptime Kuma: Fix db backup file causing app to not start.

roles/uptime-kuma/tasks/backup.yml

@@ -18,6 +18,13 @@
       environment:
         BORG_PASSCOMMAND: "cat {{ borg_passphrase_file }}"
 
+    # The kuma-backup.db file is owned by root which causes
+    # users['uptime_kuma'] to try to take ownership when it cannot.
+    - name: Delete temporary backup file
+      file:
+        path: "{{ volumes['uptime_kuma_datadir'] }}/kuma-backup.db"
+        state: absent
+
     - name: Prune borg repository
       command:
         cmd: |