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GitHub Actions Triggers: push, pull_request, workflow_dispatch, schedule and Filters

The events and filters under on decide when a workflow runs: branches, tags, paths and ! negation for push and pull_request, activity types, workflow_dispatch inputs, timezone-aware schedules, workflow_run, repository_dispatch and merge_group. With real output we show the trap of reading booleans via github.event.inputs, the trigger mistakes actionlint catches, and why act does not evaluate filters.