Add a way to run a script before committing and pushing

[thislooksfun]

I am using this action to automatically deploy some autogenerated docs for a project of mine and I want to be able to have multiple versions of those docs at once. I have this mostly solved by using target-folder, but I also want to maintain two symlinks to the latest and stable versions.

Namely I want to be able to do the following:

• Build the documentation into the /docs folder.
• Run this action to switch to the gh-pages branch and copy /docs into the specified target-dir.
• Create/update the latest and stable symlinks. <-- This is the step that's missing.
• Push the changes.

My naïve solution would be to add an optional pre-commit option that is executed as a script before committing.

[thislooksfun]

I managed to get the behavior I wanted a different way. thislooksfun/snoots@c29cae5. I still think this would be useful, but I no longer require it personally.

[JamesIves]

This would have been my suggestion. The sole responsibility of this action is to run the deployment job, outside of that it's up to you to run any pre/post scripts as their own steps.