The correct option is workflow_dispatch because it allows manual on demand runs from the Actions tab and it can also be triggered through the GitHub CLI and the REST API.

With this manual dispatch event you can start the workflow precisely during the 90 minute maintenance window and you can pass inputs if needed. The Actions tab provides a Run workflow button when this event is configured and the GitHub CLI and the REST API both invoke the same dispatch to start the run on demand.

schedule is time based and runs on a cron expression and it cannot be started immediately from the Actions tab or by direct calls through the GitHub CLI or the REST API.

push runs when commits are pushed to the repository and it is not a manual trigger from the Actions tab and it is not directly invokable through the GitHub CLI or the REST API without a commit.

pull_request runs on pull request activity such as opening or updating a pull request and it is not intended for ad hoc manual runs from the Actions tab or from external calls.

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