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-ctl-mtn-cert-renew/templates/systemctl.service.j2

@@ -5,4 +5,4 @@ OnFailure={{ SYS_SERVICE_ON_FAILURE_COMPOSE }}
 [Service]
 Type=oneshot
 ExecStart=/usr/bin/certbot renew --quiet --agree-tos
-ExecStartPost=/usr/bin/docker restart {{ applications | get_app_conf('svc-prx-openresty', 'docker.services.openresty.name', True) }}
+ExecStartPost=/usr/bin/docker restart {{ applications | get_app_conf('svc-prx-openresty', 'docker.services.openresty.name') }}