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f7e29c15d5
Persisting a new baseline on every push to master (which happens many times a day) burns a full production build each time for no benefit a once-a-day refresh doesn't already cover -- a day-old baseline is fine for catching relative regressions on PRs. Moves baseline persistence to a new frontend-bundle-size-nightly.yml (schedule + workflow_dispatch), and restricts superset-frontend.yml's bundle-size job to pull_request only: compare-and-alert against the last nightly baseline, never persist. Also caches webpack's persistent filesystem build cache (superset-frontend/.temp_cache) across CI runs via actions/cache, keyed on the same files webpack's own `buildDependencies` invalidates on. Without this, every PR run would pay the full cold-build cost (several minutes) instead of the ~20s warm-build cost the cache is supposed to buy -- GH-hosted runners are fresh VMs with nothing carried over between jobs, so the cache has to be restored explicitly or it does nothing.