tests/azure: Set ANSIBLE_LIBRARY to fix unknown interpreter issue

The ANSIBLE_LIBRARY environment variable needs to point to molecule
directory.

tests/azure/templates/playbook_tests.yml

@@ -44,6 +44,8 @@ jobs:
       cp -a plugins/module_utils/* ~/.ansible/module_utils
       molecule create -s ${{ parameters.scenario }}
     displayName: Setup test container
+    env:
+      ANSIBLE_LIBRARY: ./molecule
 
   - script: |
       pytest \