plan-preview returns "no updated applications" when trigger.onCommit.disabled is true

In our setup every app has trigger.onCommit.disabled: true.

The side effect is that pipectl plan-preview (and the actions-plan-preview GitHub Action) always returns "no updated applications" for us. We lose the PR diff preview entirely, even though that's
exactly what we'd want during code review.

The gate is here:

// pkg/app/piped/trigger/determiner.go
func (d *OnCommitDeterminer) ShouldTrigger(...) (bool, error) {
    if appCfg.Trigger.OnCommit.Disabled {
        return false, nil
    }
    ...
}

builder.findTriggerApps uses the same determiner, so apps with onCommit.disabled: true are filtered out before any diff is computed.

Would it be possible to add a flag like --skip-trigger-check to pipectl plan-preview (and a corresponding input on actions-plan-preview) that bypasses this gate? plan-preview is a read-only operation, so
opting in per-invocation feels safer than changing the app config. Default would stay as today.

Happy to send a PR if the direction sounds good.

Start in pkg/app/piped/trigger/determiner.go and trace how builder.findTriggerApps is used by pipectl plan-preview and the actions-plan-preview GitHub Action. Check the existing plan-preview flag and action-input entry points first; done means an opt-in bypass produces the PR diff preview for apps with trigger.onCommit.disabled, while the default behavior remains unchanged.