postfixadmin: make setup.php invocations idempotent and error-aware

roles/postfixadmin/tasks/bootstrap.yml

@@ -50,8 +50,4 @@
       submit: 'Add Admin'
     return_content: yes
   changed_when: yes
-  register: postfixadmin_register_boostrap_create_admin
-
-- name: print the response of setup.php since the status code is inaccurate
-  ansible.builtin.debug:
-    var: postfixadmin_register_boostrap_create_admin.content
+  failed_when: '"Admin addition failed" in postfixadmin_register_boostrap_create_admin.content or postfixadmin_register_boostrap_create_admin.status != 200'

roles/postfixadmin/tasks/config.yml

@@ -13,4 +13,7 @@
     url: "{{ postfixadmin_bootstrap_base_url }}/setup.php"
     return_content: yes
   register: postfixadmin_register_setup_upgrade
-  changed_when: "'   done' in postfixadmin_register_setup_upgrade.content"
+  changed_when:
+    - "'Database is up to date' not in postfixadmin_register_setup_upgrade.content"
+    - "'   done' in postfixadmin_register_setup_upgrade.content"
+  failed_when: '"Something went wrong while trying to apply database updates" in postfixadmin_register_setup_upgrade.content or postfixadmin_register_setup_upgrade.status != 200'