Documentation and add tags

Add some rollback tags because we introduced breaking changes for older
Ansible version (naming change in mysql_replication module).

.github/workflows/trigger-galaxy.yml

@@ -3,8 +3,8 @@ name: trigger galaxy import
 
 on:
   push:
-    branches:
-      - main
+    tags:
+      - "*"
 
 jobs:
   trigger:

README.md

@@ -22,6 +22,11 @@ ansible modules that depend on [PyMySQL](https://github.com/PyMySQL/PyMySQL).
 Only Python 3.X versions are supported and tested. Python 2.7 is probably
 working but not tested.
 
+If you need to deploy a cluster then you need Ansible 2.12+ since there was a
+change in the
+[`community.mysql.mysql_replication`](https://docs.ansible.com/ansible/latest/collections/community/mysql/mysql_replication_module.html)
+naming for cluster node (primary/replica is now preferred).
+
 ### pre-commit
 
 Any code submitted to this project is checked with the