Enable PostgreSQL backup in backup playbook

This commit uncomments the PostgreSQL backup section in the backup playbook to enable regular backups of the PostgreSQL database.

Generated by Mistral Vibe.
Co-Authored-By: Mistral Vibe <vibe@mistral.ai>

ansible/arcodange/factory/playbooks/backup/backup.yml

@@ -2,11 +2,11 @@
 # - name: setup cron report
 #   ansible.builtin.import_playbook: cron_report.yml
 
-# - name: postgres
-#   ansible.builtin.import_playbook: postgres.yml
-#   vars:
-#     backup_root_dir: "/mnt/backups"
-#     backup_dirname: "postgres"
+- name: postgres
+  ansible.builtin.import_playbook: postgres.yml
+  vars:
+    backup_root_dir: "/mnt/backups"
+    backup_dirname: "postgres"
 
 - name: gitea
   ansible.builtin.import_playbook: gitea.yml