Add container-aware execution logic and CI stability fixes

- Introduce global IS_CONTAINER flag based on ansible_virtualization facts
- Skip systemd-based handlers and tasks when running inside containers
- Extend EXCLUDED_ROLES list in GitHub Actions test-deploy workflow
- Ensure docker.sock is mounted for all CI deploy stages
- Improve sys-svc-docker by suppressing service restarts inside containers
- Add meta: flush_handlers to properly trigger delayed docker restarts
- Update sys-service handlers with container guards
- Update sys-timer tasks to avoid systemctl inside CI containers
- Enhance drv-non-free role with Manjaro detection and mhwd fallback warning
- Skip swapfile generation in containers
- Minor service template fixes and cleanup in proxy.conf.j2

Details and discussion: https://chatgpt.com/share/6930a4ca-56f4-800f-9b3d-4791f040a03b

roles/sys-timer/tasks/main.yml

@@ -12,6 +12,8 @@
     name: "{{ sys_timer_file }}"
     state: restarted
     enabled: yes
-  when: dummy_timer.changed or SYS_TIMER_ALL_ENABLED | bool
+  when:
+    - dummy_timer.changed or SYS_TIMER_ALL_ENABLED | bool
+    - not (IS_CONTAINER | bool)
   async: "{{ ASYNC_TIME if ASYNC_ENABLED | bool else omit }}"
   poll:  "{{ ASYNC_POLL if ASYNC_ENABLED | bool else omit }}"