Added code to load the var.file for ansible integration tests

Author: sathiya-nhs

ansible/collections/ansible_collections/nhsd/apigee/roles/validate_manifest/tasks/main.yml

@@ -22,7 +22,8 @@
 - name: Load vars.yml for {{ DIST_DIR }}
   include_vars:
     file: "{{ DIST_DIR }}/vars.yml"
-
+  when: DIST_DIR is not defined
+  
 - name: validate manifest
   nhsd.apigee.validate_manifest:
     manifest: "{{ manifest }}"