Don't upgrade all package when running idempotency checks with molecu…

…le (#6)

- ignore the task to upgrade all packages when running idempotency
checks with molecule
- this is to avoid failing the idempotency checks when this role is used
as part of the [XNAT
collection](https://github.com/UCL-MIRSG/ansible-collection-xnat)

tasks/main.yml

@@ -11,6 +11,8 @@
   ansible.builtin.yum:
     name: "*"
     state: latest
+  tags:
+    - molecule-idempotence-notest
 
 - name: Ensure epel is installed
   become: true