DCD-224: Generalise and expand testing of product base role.

roles/product_base/molecule/default/molecule.yml

@@ -6,8 +6,10 @@ driver:
 lint:
   name: yamllint
 platforms:
-  - name: instance
-    image: centos:7
+  - name: amazon_linux2
+    image: amazonlinux:2
+  - name: ubuntu_lts
+    image: ubuntu:bionic
 provisioner:
   name: ansible
   lint: