[MarouaBoud]

Adds a daily schedule trigger (and workflow_dispatch) to publish.yml, so exports and archive snapshots refresh every day rather than only when a commit touches incidents//schema//scripts/.

Why

publish.yml was push-only, so the chore(export): refresh exports commits appeared only on days with an incident push. A daily run also keeps archive.org snapshots current (via check_links.py --backfill), which can change exports even with no new incidents.

Safety

No job-body change is needed — the workflow is already timer-safe:

• It reset --hards to origin/main and rebuilds exports from scratch; it never relies on the push's changed-paths diff, so a scheduled run behaves identically to a push run.
• The git diff --cached --quiet -> "nothing to publish"; return 0 guard makes a no-change day a clean success — no empty commit, no failure.
• [skip ci] on the export commit still prevents self-triggering loops.

Cron is 0 7 * * * (07:00 UTC), offset from the weekly jobs at 09:00/10:00 UTC.