update postgresql_server

tasks/pkgs/postgresql_server.yml

@@ -1,5 +1,15 @@
 # vim: set filetype=yaml.ansible:
 ---
-- name: Append postgresql server to pkg_sys
+- name: Add postgresql_server
+  when:
+    - postgresql_server_configured is undefined
+  block:
+    - name: Load postgresql_server config
+      ansible.builtin.include_tasks:
+        file: config/postgresql_server.yml
+
+    - name: Append postgresql server to pkg_sys
+      when:
+        - postgresql_server.method == 'sys'
       ansible.builtin.set_fact:
         pkg_sys: "{{ pkg_sys + postgresql_server.pkgs }}"