Refactor file path in actions-validate.yml and add output for changed files

.github/actions/setup-env/action.yml

@@ -1,5 +1,9 @@
 name: Setup Environment
 description: Prepare the environment for A13labs CI/CD pipelines
+outputs:
+  changed_files:
+    description: The list of changed files in the current pull request
+    value: ${{ steps.get_changed_files.outputs.CHANGED_FILES }}
 
 runs:
   using: "composite"

.github/workflows/ansible-apply-playbook.yml

@@ -32,6 +32,7 @@ jobs:
           VAULT_MASTER_PASSWORD: ${{ secrets.VAULT_MASTER_PASSWORD }}
           ANSIBLE_USER: ${{ secrets.ANSIBLE_USER }}
           SSH_AUTH_SOCK: /tmp/ssh_agent.sock
+          CHANGED_FILES: ${{ steps.get_changed_files.outputs.CHANGED_FILES }}
         run: |
           cd ansible
           for PLAYBOOK in $(echo $CHANGED_FILES | grep -oP 'playbook_\K\w+'); do