Add cleanup task for MIG roles directory and restructure build_data tasks

Conversation: https://chatgpt.com/share/6926bece-332c-800f-a5f6-b76fe8cb42fa

roles/web-app-mig/tasks/01_core.yml

@@ -10,8 +10,10 @@
     docker_compose_flush_handlers:  true
     docker_pull_git_repository:     true
 
-- name: Build data (single async task)
-  include_tasks: 02_build_data.yml
+- include_tasks: 02_cleanup.yml
+  when: MODE_CLEANUP | bool
+
+- include_tasks: 03_build_data.yml
   when: MIG_BUILD_DATA | bool
 
 - include_tasks: utils/run_once.yml

roles/web-app-mig/tasks/02_cleanup.yml

@@ -0,0 +1,5 @@
+- name: "Cleanup MIG roles directory (remove all contents safely)"
+  file:
+    path: "{{ MIG_ROLES_DIRECTORY }}"
+    state: directory
+    mode: "0755"