Add workaround for lint error caused by redhat-subscription

Author: chenwng

.github/workflows/ansible-lint.yml

@@ -19,5 +19,10 @@ jobs:
       - name: Install dependency
         run: ansible-galaxy collection install -r requirements.yaml
 
+      # This works around the lint error from `ansible-playbook --syntax-check -vv playbooks/install_stack.yaml`
+      # [ERROR]: Could not find specified file in role, its 'tasks/' is not usable.
+      - name: Prepare redhat-subscription
+        run: git clone --depth 1 --branch 1.3.0 https://opendev.org/openstack/ansible-role-redhat-subscription.git $HOME/.ansible/roles/redhat-subscription
+
       - name: Run lint
-        run: ansible-lint playbooks/**
+        run: export ANSIBLE_COLLECTIONS_PATH=$HOME/.ansible/collections; ansible-lint playbooks/**