add tzdata-legacy optional dependency (#80334)

Optional as it is only available from trixie onwards.
This playbook should still be compatible with bullseye & bookworm.

roles/base/tasks/main.yml

@@ -38,6 +38,14 @@
     state: present
   become: yes
 
+- name: Install optional packages
+  apt:
+    name:
+       - tzdata-legacy
+    state: present
+  become: yes
+  ignore_errors: true
+
 - name: "create the postgresql user named {{user}}"
   postgresql_user:
     name: "{{user}}"