Feature request: Stricter success reporting

[relsqui]

Please describe your suggestion: 提案の概要

I'm using this action to trigger a notification when a deployment workflow fails. In this workflow, a job being skipped always means something went wrong and we should be notified, but this action reports a successful conclusion even when jobs are skipped.

Describe the solution you'd like: 考えうる解決方法

Only report the conclusion as success if all jobs were actually successful.

For backwards compatibility, this behavior could be behind a boolean input variable like strict_success and default to false.

Describe alternatives you've considered: 考えうる代替案

Outputting the list of results for all jobs would also serve my purposes, but I see you already turned down that suggestion in #53. The workaround in your comment there doesn't work for me, because this notification is a reusable job we call from different workflows -- to get each job result myself, I would have to reimplement most of workflow-conclusion-action (which is why I'm requesting it here instead).

Additional context: 補足

If you're open to this feature but don't have time for it, I can try making a PR for it.

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[relsqui]

Thank you!