Restore project APT repos which are more up-to-date than Debian repo

Closes tildes-community/tildes-cf#31

See merge request tildes-community/tildes-cf!15

ansible/roles/postgresql/tasks/main.yml

@@ -1,4 +1,12 @@
 ---
+- name: Add APT key for PostgreSQL repository
+  apt_key:
+    url: https://www.postgresql.org/media/keys/ACCC4CF8.asc
+
+- name: Add PostgreSQL APT repository
+  apt_repository:
+    repo: deb https://apt.postgresql.org/pub/repos/apt bookworm-pgdg main
+
 - name: Install PostgreSQL
   apt:
     name: postgresql-{{ postgresql_version }}