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-svc-docker/handlers/main.yml

@@ -1,6 +1,7 @@
 ---
 - name: docker restart
-  service:
+  ansible.builtin.service:
     name: docker.service
     state:  restarted
     enabled: yes
+  when: not (IS_CONTAINER | bool)

roles/sys-svc-docker/tasks/01_core.yml

@@ -8,6 +8,9 @@
     state: present
   notify: docker restart
 
+- name: Restart and enable docker service
+  meta: flush_handlers
+
 - name: Setup Swapfile to prevent OOM Failures
   # @ See https://en.wikipedia.org/wiki/Out_of_memory
   include_role: