Fix backup if LFS is disabled to bypass upstream error

  - go-gitea/gitea#23730
  - Explicitly skips LFS data, if you're not TEN7 and use this, be careful!
  - Also skips Index from backup, since this doesn't take long to regenerate.

Author: madeline-holland

tasks/backup.yml

@@ -43,7 +43,10 @@
     command: >
       gitea dump
       --type {{ _backup_file_suffix }}
-      --file /tmp/{{ _backup_file_prefix }}
+      --custom-path /tmp/
+      --file {{ _backup_file_prefix }}
+      --skip-lfs-data
+      --skip-index
 
 - name: Generate the backup file name.
   set_fact: