make it work on centos8

tasks/main.yml

@@ -1,6 +1,7 @@
 ---
   - name: OS vars
-    include_vars: "{{ ansible_distribution|lower }}.yml"
+    include_vars: "{{ ansible_distribution|lower }}{{ ansible_distribution_major_version }}.yml"
+    tags: always
 
   - name: install prerequisite
     package:

vars/centos8.yml

@@ -0,0 +1,3 @@
+packages_list:
+- python3-mysql
+admin_group: wheel