Refactor MIG build process to run asynchronously with optional wait control

- Moved MIG data build commands into a dedicated 02_build_data.yml task file.
- Added async execution (async: 3600, poll: 0) for non-blocking build.
- Introduced mig_wait_for_build variable to optionally wait for completion.
- Added debug message to inform how to disable waiting via build_data.wait_for=false for performance.
- Updated config to use nested build_data.enabled and build_data.wait_for structure.
- Adjusted variable lookups accordingly.

https://chatgpt.com/share/689b54d2-e3b0-800f-91df-939ebc5e12ef

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

@@ -0,0 +1,38 @@
+- name: Build data (single async task)
+  shell: |
+    set -euo pipefail
+    infinito build tree --no-signal --alarm-timeout 0 -s {{ mig_roles_meta_volume }}
+    infinito build roles_list --no-signal --alarm-timeout 0 -o {{ mig_roles_meta_list }}
+  async: 3600
+  poll: 0
+  register: mig_build_job
+
+- name: Fail if MIG build job did not start
+  fail:
+    msg: >
+      MIG build job failed to start. No job ID returned.
+  when: mig_build_job.ansible_job_id is not defined
+
+- name: Debug MIG build job ID
+  debug:
+    msg: "MIG build job started with ID: {{ mig_build_job.ansible_job_id }}"
+  when: enable_debug | bool
+
+- debug:
+    msg: "Waiting for MIG build job to finish. Set 'build_data.wait_for=false' in the application config to skip waiting and improve performance."
+  when: mig_wait_for_build | bool
+
+- name: Wait for MIG build job to finish (enforce failure)
+  async_status:
+    jid: "{{ mig_build_job.ansible_job_id }}"
+  register: mig_build_result
+  until: mig_build_result.finished
+  retries: 360
+  delay: 10
+  when:
+    - mig_wait_for_build | bool
+  failed_when:
+    - mig_build_result.result is defined
+    - mig_build_result.result.rc is defined
+    - mig_build_result.result.rc != 0
+