File /etc/my.cnf is standard in mariadb

- Don't anticipate the users to change it, so removing the option.
- Add the config_file param to other tasks using ansible modules.

For reference, the workaround with config_file is needed due to a change in
mysql libs used by ansible (see ansible/ansible#47736)

defaults/main.yml

@@ -37,9 +37,6 @@ mysql_secure: true
 # Root password
 mysql_root_password: mysql
 
-# location of config_file 
-mysql_config_file: /etc/my.cnf
-
 # Backup (deactivated by default)
 # Default user password and contact email use the local 'mysqlbck' acocunt
 mysql_backup: false

tasks/main.yml

@@ -69,7 +69,7 @@
 
 - block:
   - name: Secure installation
-    mysql_user: name=root host={{item}} check_implicit_admin=yes password='{{mysql_root_password}}' login_user=root login_password='{{mysql_root_password}}' config_file={{mysql_config_file}}
+    mysql_user: name=root host={{item}} check_implicit_admin=yes password='{{mysql_root_password}}' login_user=root login_password='{{mysql_root_password}}' config_file=/etc/my.cnf
     with_items:
       - '{{ansible_fqdn | lower}}'
       - '{{ansible_hostname | lower}}'
@@ -79,28 +79,28 @@
     when: mysql_root_password != ''
 
   - name: Remove anonymous users
-    mysql_user: name='' host={{item}} state=absent login_user=root login_password='{{mysql_root_password}}' config_file={{mysql_config_file}}
+    mysql_user: name='' host={{item}} state=absent login_user=root login_password='{{mysql_root_password}}' config_file=/etc/my.cnf
     with_items:
       - '{{ansible_hostname | lower}}'
       - '{{ansible_fqdn | lower}}'
       - localhost
 
   - name: Remove test database
-    mysql_db: name=test state=absent login_user=root login_password='{{mysql_root_password}}' config_file={{mysql_config_file}}
+    mysql_db: name=test state=absent login_user=root login_password='{{mysql_root_password}}' config_file=/etc/my.cnf
 
   when: mysql_secure
 
 - import_tasks: encryption.yml
   when: mysql_encryption_enabled and mysql_encryption_key_plugin == 'file'
 
 - name: Add databases
-  mysql_db: name={{item.name}} state=present login_user=root login_password='{{mysql_root_password}}'
+  mysql_db: name={{item.name}} state=present login_user=root login_password='{{mysql_root_password}}' config_file=/etc/my.cnf
   with_items: '{{mysql_databases}}'
   loop_control:
     label: '{{item | combine({"password": "***"})}}'
 
 - name: Add users
-  mysql_user: name={{item.0.user}} host={{item.1}} password='{{item.0.password}}' priv='{{item.0.name}}.*:{{item.0.privileges | default("ALL")}}' state=present login_user=root login_password='{{mysql_root_password}}' append_privs='{{mysql_append_privs}}'
+  mysql_user: name={{item.0.user}} host={{item.1}} password='{{item.0.password}}' priv='{{item.0.name}}.*:{{item.0.privileges | default("ALL")}}' state=present login_user=root login_password='{{mysql_root_password}}' append_privs='{{mysql_append_privs}}' config_file=/etc/my.cnf
   with_subelements:
     - '{{mysql_databases}}'
     - hosts